Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc3df20218db97a…

MALICIOUS

PDF

32.7 KB Created: 2020-08-05 17:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15de62bf19487d8581a0975c122adb6f SHA-1: 529af736314307b1147a9f12d6126145ff40cfb0 SHA-256: acc3df20218db97ad176a66fb9db8d06b5a1fc8098a2db73186a56c36210d453
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though partially obfuscated, contains text related to 'Buku akuntansi sektor publik pdf' and the malicious URL itself. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to Shopify domains, likely as a camouflage. The primary malicious IOC is the redirector URL, which is designed to lead users to further 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.cc/pify?keyword=buku+akuntansi+sektor+publik+pdf
    • http://files.amazinggracebridgetown.ca/uploads/1/3/1/3/131383698/jurisunobimer_lekifuw.pdf
    • http://gerewo.promisestokeep.com.au/uploads/1/3/0/8/130814017/941bef602d.pdf
    • http://files.sefoa.net/uploads/1/3/1/3/131398374/kivuwozeterejebajawu.pdf
    • http://gumalabu.eastsideyoga.co.uk/uploads/1/3/1/3/131398591/tawupigu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5827/4205/files/99444850794.pdf
    • https://cdn.shopify.com/s/files/1/0440/0244/3422/files/auditoria_financiera_caso_practico.pdf
    • https://cdn.shopify.com/s/files/1/0433/7349/4430/files/mechanism_of_action_of_antiulcer_drugs.pdf
    • https://cdn.shopify.com/s/files/1/0435/9510/4424/files/91030127016.pdf
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files/37421660536.pdf
    • https://cdn.shopify.com/s/files/1/0431/2717/7365/files/90156358800.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/74407680913.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/wiwinoxarinofetuveme.pdf
    • https://cdn.shopify.com/s/files/1/0433/4593/6534/files/transtorno_borderline.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21511039237.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/46287179129.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044c1.bin
9885dd1ccde4605f053b628f73df504a23ce018a1a4c9315dc2c2b024147dfb3
pdf-font-stream PDF embedded font (sfnt) at offset 0x44C1 5288 bytes
font_01_sfnt_off000056c8.bin
4f4be4479b365f0cd0ea7a89d00fa0bfc72219570bc8d8c410f98ce1f79f6788
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C8 9168 bytes