Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ae10258cd65adb…

MALICIOUS

PDF

38.8 KB Created: 2020-08-31 06:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1dd9af09fecbdcd812eefdb53273749e SHA-1: 7f24b75a9742b769ad2281e9f5e32d8289f3afba SHA-256: 86ae10258cd65adb3864536638eaca02b9bc1a2e2ac88890901d617f161a5e94
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. The ML classifier strongly indicated maliciousness. The document body appears to be garbled, but the presence of the malicious URL and the link farm heuristic suggest a lure to a malicious site, likely for further payload delivery or phishing. No scripts were extracted from this sample.

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/wix?keyword=d%25C3%25B6ner+merdiven+plan
    • https://cdn.shopify.com/s/files/1/0438/1592/7965/files/zedegimaveraditilubimo.pdf
    • https://cdn.shopify.com/s/files/1/0445/8243/7028/files/ciudad_fantasma_bernardo_esquinca.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0440/6394/8950/files/jujavaweraxomekifogesena.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/anatomy_and_physiology_of_cardiovascular_system.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/fiddlesticks_mid_build.pdf
    • https://static.usrfiles.com/ugd/67e251_013a7cccd60d42f5955ea0830b86eb72.pdf
    • https://static.usrfiles.com/ugd/585b1d_59ec89c742ac4af1b1d31c43c9973f58.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/movod.pdf
    • https://cdn.shopify.com/s/files/1/0430/1396/3929/files/bird_alarm_tone_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/79283998670.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ada.bin
a4dc722048af150d77f987d955be71128d523f2b78470fa4af57c944d9cbe22e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4ADA 4724 bytes
font_01_sfnt_off00005ac2.bin
ba3f210f169964f3ad95f4e954d61c8a4fc5a9548e701e7c1116e329c36401fc
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AC2 11620 bytes
font_02_sfnt_off00007f2e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F2E 4324 bytes