Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d81d57f78aac379…

MALICIOUS

PDF

46.8 KB Created: 2020-08-05 10:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3345439e6ae97487bd59a0ffdc0bacb5 SHA-1: e7a291dc65fa7813387f595192c923bb2028d371 SHA-256: 6d81d57f78aac379bbda7f34d2818f1e7d06a74c8e25eb35565fee135121292c
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=audio+visual+aids+pdf'. It also exhibits a PDF link farm heuristic, containing numerous external PDF links, many hosted on Shopify. The document body, though heavily obfuscated, contains the same malicious URL. This suggests the primary goal is to redirect users to 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.ru/pify?keyword=audio+visual+aids+pdf
    • http://sofup.debatebsme.com/uploads/1/3/1/6/131606349/moterigegelo.pdf
    • http://files.achievewithaimee.com/uploads/1/3/1/6/131606127/fc69d.pdf
    • http://files.perimeterdrainagevictoria.com/uploads/1/3/0/7/130740571/8078505.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/practical_multivariate_analysis_fifth_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/0202/6393/files/voraxeburaxixovu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/13121593915.pdf
    • https://cdn.shopify.com/s/files/1/0433/7424/8101/files/92708240987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/depusulolunifanilux.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4263/files/gukawumunutonopep.pdf
    • https://cdn.shopify.com/s/files/1/0431/6086/2882/files/rubibuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6886/files/rumupazurojidakamuwad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vibemegabixowosepabotabux.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/ligobomugowudasekafafir.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/49417562424.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_off00007b40.bin
955fa6676283ad146d84decbf102bdf183f9d167a1ef8ebe3205d24c328578f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B40 4988 bytes
font_01_sfnt_off00008c56.bin
e66c80f1f8dac0f13efce7c478570b7f37eb9e1fbb857ed52e2907f933143e7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C56 9996 bytes