Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ab5479b817dbb2…

MALICIOUS

PDF

47.0 KB Created: 2020-07-31 15:08:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a53b0019ee9f1f263dffa504f6fc39c SHA-1: b7c7dbd12d065cf394ac006680a4a655203dc98a SHA-256: 70ab5479b817dbb2f94b4e07caa31ee9803c13f5de2372babd1eb156721e8897
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a link farm, with numerous external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.com/pify?keyword=life+and+death+in+shanghai+pdf+download
    • http://files.polarispsychology.ca/uploads/1/3/2/6/132682076/rutamutoz.pdf
    • http://files.ps38rclc.org/uploads/1/3/0/7/130740242/nufitifuwasa_menubotuwasowo.pdf
    • http://files.abundantbehavioralhealth.com/uploads/1/3/0/7/130739056/d8b3a51851.pdf
    • http://files.lizastories.com/uploads/1/3/1/4/131406698/2353052.pdf
    • http://files.tastecoffeeonline.co.uk/uploads/1/3/1/1/131164556/vovibir_taduzabepodefus_lunokojudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/gifera.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4201/files/xedalogofobareloxagigegup.pdf
    • https://cdn.shopify.com/s/files/1/0430/2258/1923/files/babupekanok.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/wagexiromexuguwar.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3128/files/geresomajefidosutisobatut.pdf
    • https://cdn.shopify.com/s/files/1/0429/7372/4825/files/40593467622.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/12439877651.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/ravol.pdf
    • https://cdn.shopify.com/s/files/1/0434/1910/7480/files/gafopekamoguto.pdf
    • https://cdn.shopify.com/s/files/1/0438/0190/3264/files/nisojatakigane.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3751/files/78531883357.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_off00007904.bin
d90459f8d510ff3a3648be5308e6c841e86cff3345315fa0683ba295c9ac5175
pdf-font-stream PDF embedded font (sfnt) at offset 0x7904 5028 bytes
font_01_sfnt_off00008a32.bin
3c4885a4ef6551f7689efa82dbdc2d5c954258dfc408b3aa91031d62fb3771a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A32 10196 bytes