Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3b4497c82ad112…

MALICIOUS

PDF

73.8 KB Created: 2020-08-16 14:45:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13e4f4d6a413439b6ef90200a9d3dea3 SHA-1: 4221d16a79ab94fcd1359462836f231a45566492 SHA-256: 2a3b4497c82ad112300e6cf1f13e6acd6e616c42ff9f8db013b940400c68edfd
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/pify?keyword=auf+wiedersehen+pet+series+1+episode+guide, which is likely used to funnel victims to further malicious content.

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 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.
  • 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://ttraff.cc/pify?keyword=auf+wiedersehen+pet+series+1+episode+guide
    • http://files.seasidehomedesign.com/uploads/1/3/1/8/131856338/busorez.pdf
    • http://files.treevalleyfencing.co.uk/uploads/1/3/0/7/130776246/9265773.pdf
    • http://files.iwanderwhy.net/uploads/1/3/0/7/130776041/kadudanal-nomati-nedex-danaxekapivit.pdf
    • http://posun.properevents.net/uploads/1/3/1/6/131606279/7141407.pdf
    • http://nevakofog.easystreetdiscount.com/uploads/1/3/2/8/132814930/zidesot-dofarixo-fipilorub-masisatop.pdf
    • https://cdn.shopify.com/s/files/1/0435/4516/5975/files/47308262523.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/25365848252.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/fokeno.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/zumdahl_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/polegixasatasitopeb.pdf
    • https://cdn.shopify.com/s/files/1/0439/1829/5195/files/61207321439.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98559129476.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7033/files/68065308195.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/xesolenanux.pdf
    • https://cdn.shopify.com/s/files/1/0439/8995/8814/files/autocad_import_text_recognition.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fc.bin
c881fae0163b07ea957a9b245f06eb0291e1b9732e0e6395ef771a61d0b675bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 5192 bytes
font_01_sfnt_off0000e2bd.bin
cf80d116b0c3d995f81a886e544a9c0922ce1a830db6b83602d6faf3c0903e8b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BD 17528 bytes