Malicious PDF — malware analysis report

Static analysis result for SHA-256 501bb861112bf7e0…

MALICIOUS

PDF

53.1 KB Created: 2020-10-29 05:27:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c4c9a8ae9862f2652d537927fe5b8e28 SHA-1: e83fd8255a9069356e525494437c84c08d2d56d7 SHA-256: 501bb861112bf7e066fb3cd8b456903b9fa6cdd666a678f7bbacc819da2e58de
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lead users to malicious sites, potentially for phishing or malware distribution, rather than providing legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/123?keyword=baseline+security+analyzer+windows+10 In PDF document text
    • https://poroxokinawutaj.weebly.com/uploads/1/3/4/5/134507376/defazebasifife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5f8e5d07f356d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5f8bee8042f9d.pdfIn PDF document text
    • https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/sokilijaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394062/normal_5f912a0ccbf1d.pdfIn PDF document text
    • https://gumiworawogulaf.weebly.com/uploads/1/3/4/3/134356348/1524028.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/zezasajikuwew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379848/normal_5f9080bce8210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381297/normal_5f9a31ac380c9.pdfIn PDF document text
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/lepixe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372377/normal_5f8b6a3ae45a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376869/normal_5f9149be14df8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pukiza/peppermint_beadlets.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7246/3772/files/22743441197.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/determination_of_salivary_amylase_activity.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/7497/2567/files/72561839781.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/6466/7541/files/jijalenigurugupavop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/2805/6728/files/technivorm_moccamaster_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/44826103624.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/82374658769.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4846/8631/files/dadibokutorinidot.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/36599831457.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/8158/9417/files/reduce_bitmap_size_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/juxaxapenavo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8019 5304 bytes
SHA-256: 6330f81b624a274ea0a123325852d12dfb0ac919a3d2f7ffd9c6f4db4ad8e6b6
font_01_sfnt_off00009245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9245 11280 bytes
SHA-256: 93f3eaab3c5e2fca341b31cab1e18fe1275452f41a354cebee4ae2e8d2990e3b
font_02_sfnt_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2