Malicious PDF — malware analysis report

Static analysis result for SHA-256 641f9886a13c1769…

MALICIOUS

PDF

43.3 KB Created: 2020-10-17 11:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 982c849ea8f03fbad385b34f05770b8e SHA-1: 78e0af7d5f07ad908192a6646549cb77318d2231 SHA-256: 641f9886a13c1769274551a3ded6ef24e5434049df3fc1f7f817225125590237
184 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, and one critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests an attempt to lure users to malicious sites, potentially for further exploitation or phishing.

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=bose+qc20+apple+or+android In PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdfIn PDF document text
    • https://dupizonax.weebly.com/uploads/1/3/1/3/131380343/41ab824efb44d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5f885e579cf1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5f899701c8de7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_5f8a14fb701e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366659/normal_5f875b72673cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368985/normal_5f87f52927320.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/4609940.pdfIn PDF document text
    • https://suzokixuvajix.weebly.com/uploads/1/3/0/7/130776208/2b9945f720e.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/sabozajerurutu_demepej_rarizor_lovozi.pdfIn PDF document text
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/b3f38b669d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368731/normal_5f8a81e39c659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369766/normal_5f8826f47bf78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374196/normal_5f8a081275b07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f89032707a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f89126e5efb0.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/1/0479/8237/9164/files/word_search_printable_large_print.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5698/7799/files/van_meter_monster_wikipedia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/7481/8726/files/1912173392.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0501/8697/7441/files/pci_express_m.2_specification_revision_1.0.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/1631/3758/files/girepopunuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/2056/9752/files/what_is_the_stomata.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_off00006820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5516 bytes
SHA-256: c2b8ef0b8ee8f2b0d5b01716fd458c735a6067c200d4181aa44121fdde40861f
font_01_sfnt_off00007ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7AE8 10412 bytes
SHA-256: 182c983bb89a2ace2193ed0ea48186571dee3454961b7f5adbbdb8bf285769d5