Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6589245aa61ab6…

MALICIOUS

PDF

42.5 KB Created: 2020-10-16 07:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cc18f12b6aa971e2f8fb0dc888208633 SHA-1: f5137f9dd5d80277c79741c282bceb8a08b411db SHA-256: ff6589245aa61ab6e675aa491d5b80238d7601a8724207ac38d8d287f32809d0
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high density of embedded links, with many pointing to disposable domains or redirectors, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest an attempt to lure users to malicious content or to manipulate search engine rankings.

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://gettraff.ru/123?keyword=appium+inspect+element+android In PDF document text
    • https://dojudiwoju.weebly.com/uploads/1/3/1/4/131406456/26bc8a275.pdfIn PDF document text
    • https://gikoberi.weebly.com/uploads/1/3/0/9/130969260/3882295.pdfIn PDF document text
    • https://jusujonolixutuw.weebly.com/uploads/1/3/1/3/131379247/sozimi-zuzibetazoz-gadinakonekar-busipamelupufus.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/metor.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdfIn PDF document text
    • https://jezaxegare.weebly.com/uploads/1/3/1/3/131380636/1103a62.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/1abcb37d8b44.pdfIn PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/ce2a1618b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369330/normal_5f8827f46f0b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f88709377e44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370780/normal_5f88353185ce7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5f887f9e9cd70.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/1/0496/6875/1523/files/wanisabowozunomomele.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7583/5806/files/can_the_blue_wii_play_gamecube_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/3937/1676/files/fidizujepugomop.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/5740/0994/files/apk_virus_scanner_reddit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/5421/1487/files/suwudelajepigexamebik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0902901b-80f1-4b49-831c-8fd52a360674/tamavorug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2914991f-75f7-4cfa-a039-dbc06b34fff6/75847646847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03a2a29d-de2d-4a50-8dd7-b56c69dcd82e/kemimepetafakib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db24849a-29d0-44da-a106-73786858a11d/81738719375.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_off000061d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61D6 5208 bytes
SHA-256: 70a755440841e4c7d1a099d98074723966886c5253b29c281013c31ee31fd38a
font_01_sfnt_off00007365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 12752 bytes
SHA-256: 617a5c19c1fcb97fc137fa9fc114aec5257da2328ba5d101adb142e219567668