Malicious PDF — malware analysis report

Static analysis result for SHA-256 692cb135f3c62dc8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-06 15:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000f8d5e1d90b9a2d07138db05f39152 SHA-1: 3f35e4f494132343bf741a846d630d4cce86f91a SHA-256: 692cb135f3c62dc8b562b338631135bee537d9f46caf6e1360b8b07905bea723
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, with the primary link pointing to a redirector service (ttraff.cc). This suggests an attempt to obscure the final malicious destination, likely for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the presence of numerous external links supports a link farm or redirection tactic.

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=definition+of+proximate+analysis+pdf
    • http://files.homelesscatrescue.co.uk/uploads/1/3/2/8/132815123/gedes_jarawosalesuko_xifegu_jozagitolilik.pdf
    • http://files.mcso-tn.org/uploads/1/3/0/7/130739535/ea3df8.pdf
    • http://files.heryellowribbon.org/uploads/1/3/1/4/131410685/liwipefizosapenubad.pdf
    • http://files.middletonchoirs.com/uploads/1/3/0/9/130969708/8933864.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/62683785858.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/konica_minolta_bizhub_c227.pdf
    • https://cdn.shopify.com/s/files/1/0434/0308/3928/files/92814370358.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/breakthrough_innovation_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/32043002831.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/joditonurites.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/toxisufujizuzagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32377204601.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/anthony_burgess_1985.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/87024427701.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/59521924556.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/radeziwiwilajumigetadad.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_off000069ff.bin
eb4e804f8d000d6486a8f459e7e7106d64a8a2c329b53eb5541c7534e0939109
pdf-font-stream PDF embedded font (sfnt) at offset 0x69FF 5356 bytes
font_01_sfnt_off00007c31.bin
5e86ec5a34a6117bbaf3a024b46b87a1d52fee7899c3604633028918b5a86ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C31 9568 bytes