Malicious PDF — malware analysis report

Static analysis result for SHA-256 a898294b47d3fe13…

MALICIOUS

PDF

56.8 KB Created: 2020-10-03 20:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 20b7daaa1b2e2aaab23ce5db8ccf7ba3 SHA-1: 733b3361a8528ade00d6002c502bd8fe357453b1 SHA-256: a898294b47d3fe1340fc0758dd072e64fa7acd76a72207809301a6e6b7f15b16
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, one of which points to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious link is sufficient evidence of a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 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://gettraff.ru/strik?keyword=oru+marubhoomi+kadha+dvdrip In PDF document text
    • https://site-1038874.mozfiles.com/files/1038874/fekiguwirubo.pdfIn PDF document text
    • https://site-1039564.mozfiles.com/files/1039564/90824891354.pdfIn PDF document text
    • https://site-1038864.mozfiles.com/files/1038864/95153637323.pdfIn PDF document text
    • https://site-1038442.mozfiles.com/files/1038442/bapanugovon.pdfIn PDF document text
    • https://site-1036719.mozfiles.com/files/1036719/8345346816.pdfIn PDF document text
    • http://files.blessingsfromabove.net/uploads/1/3/2/7/132711949/7dba17a35995c3.pdfIn PDF document text
    • http://zaduna.shit-facedshakespeare.com/uploads/1/3/2/7/132712461/dijegoba.pdfIn PDF document text
    • http://files.beyondwholistic.com/uploads/1/3/2/7/132740982/lukawedobuwexal_suxukexenifiref_finexe_wikexegewenebur.pdfIn PDF document text
    • https://site-1037125.mozfiles.com/files/1037125/nolupewurogitifowaj.pdfIn PDF document text
    • https://site-1039303.mozfiles.com/files/1039303/66701377342.pdfIn PDF document text
    • https://site-1037166.mozfiles.com/files/1037166/63227830069.pdfIn PDF document text
    • https://site-1036805.mozfiles.com/files/1036805/21105720340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/lg_60uf7700_review.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/cub_scout_songs_repeat_after_me.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9827 5280 bytes
SHA-256: 82035db4f8146535e785c5f2beca370c5736b833da8d0f7b0e5e2732af81c34b
font_01_sfnt_off0000a9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9E6 14212 bytes
SHA-256: 98d0be784e1856c5d6dec4074ed1868b5e90a886e5167071d12d2a40fbda5e73

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