Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e755bf28bfc157a…

MALICIOUS

PDF

54.1 KB Created: 2020-08-12 12:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7bfec0e6d6f941e0f5f91eabac90930 SHA-1: 23f93e027fe186c6739ee4122a862055ba735ab1 SHA-256: 5e755bf28bfc157a5776387bc70f7f75772438f07b8ff380c8f1be9120051a0a
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate "Accenture aptitude test questions and answers pdf" content, but the primary link redirects to known malicious infrastructure. The ML classifier strongly indicates maliciousness, and the PDF structure itself is suspicious due to a mass external link farm. The embedded URLs likely serve to download further malicious content or redirect to phishing 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=accenture+aptitude+test+questions+and+answers+pdf
    • http://files.kellilanee.com/uploads/1/3/1/8/131857199/lijojubuliwe_ruvamadaneve.pdf
    • http://files.3rdlayertattoo.com/uploads/1/3/0/8/130813757/8014454.pdf
    • http://gajoru.rstne.com/uploads/1/3/2/8/132814930/8351640.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8621/6352/files/junekuwim.pdf
    • https://cdn.shopify.com/s/files/1/0437/6343/3621/files/14983087865.pdf
    • https://cdn.shopify.com/s/files/1/0437/9901/9682/files/zepubitoze.pdf
    • https://cdn.shopify.com/s/files/1/0440/3258/9989/files/93170894421.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3992/files/82820354883.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kijajakunij.pdf
    • https://cdn.shopify.com/s/files/1/0436/4340/4441/files/datafidejorirolitexewur.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/xaxuvenix.pdf
    • https://cdn.shopify.com/s/files/1/0439/4447/6840/files/46167132108.pdf
    • https://cdn.shopify.com/s/files/1/0438/5816/5925/files/linode_speed_test.pdf
    • https://cdn.shopify.com/s/files/1/0434/0721/2695/files/bilawewufinefibojad.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_off0000950f.bin
0ec36861dc7324f20566dccc42eaa68fd4f88b7c852f232798fbaccda8c90b24
pdf-font-stream PDF embedded font (sfnt) at offset 0x950F 5324 bytes
font_01_sfnt_off0000a740.bin
115f416ea0155ddaa3a5905a6256ae334e6d76f1031824a4f4b735f247dbd4dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xA740 10616 bytes