Malicious PDF — malware analysis report

Static analysis result for SHA-256 65675a0f36e48ea0…

MALICIOUS

PDF

43.2 KB Created: 2020-08-04 01:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 021cb3d90accdb80d20ea2ccfa6b05d6 SHA-1: a6b7ef4439f4889a6c1d9cc773dc9cdb1ce5ae41 SHA-256: 65675a0f36e48ea0698cbde53116a3b93da64b04f32661b38ed76a91b667ce83
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body and metadata suggest it was generated by wkhtmltopdf, and the embedded links are likely part of an SEO poisoning or phishing campaign to drive traffic to malicious sites.

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=newspaper+article+structure+pdf
    • http://files.glba-urban.com/uploads/1/3/1/6/131607407/lififixezovepid-wusuxox.pdf
    • http://files.aeneidusc.com/uploads/1/3/1/4/131453394/kegajorojegidogum.pdf
    • http://files.beepbeepeurope.com/uploads/1/3/1/4/131483445/sosezatibuzexi_levepimububu_leruzadometeg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6488/5402/files/wemitagoliduzijorivipumat.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/fabedozutaxokenalatekadi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1448/7190/files/mixomozogowiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fixasitisajixumazurezeve.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7966/files/77309465582.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/is_destiny_1_still_alive.pdf
    • https://cdn.shopify.com/s/files/1/0429/4210/3719/files/mebisusulazasunobazo.pdf
    • https://cdn.shopify.com/s/files/1/0429/9892/3427/files/febazesokanenan.pdf
    • https://cdn.shopify.com/s/files/1/0436/8164/4697/files/lowes_return_without_receipt.pdf
    • https://cdn.shopify.com/s/files/1/0433/2971/6374/files/18883180267.pdf
    • https://cdn.shopify.com/s/files/1/0429/1674/1286/files/sufejijalirajebepelig.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c2f.bin
a155f1d3ad34fee125287155e9e98874ddb1edfed492cb35b1f630172c2d21f1
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2F 5208 bytes
font_01_sfnt_off00007e06.bin
441dc91c9fcbbbe56373ffd2aec99e3414679df555032336bad752aa10cfc320
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E06 10044 bytes