Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a45b9129b47ebc…

MALICIOUS

PDF

36.7 KB Created: 2020-08-06 04:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a82eba498897eef1b483ea68c16ad8a5 SHA-1: fc11bfb246d865179b90d5aefcaaede26f21cb86 SHA-256: 07a45b9129b47ebc6b713f8c8f0b0f208e76bc1f69379e85557b7884b44b2ccd
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that appear to be part of a link farm designed to distribute other PDFs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=twister+spinner+printable+pdf
    • http://files.allamericandogexpo.com/uploads/1/3/0/7/130738748/jovopowogumu_tetudepukiko_zorigexak_ruxedapopuju.pdf
    • http://files.foresitemapping.com/uploads/1/3/1/4/131437291/4ef8228.pdf
    • http://files.team-mc-fishing.com/uploads/1/3/1/4/131409677/zukizosotidafubop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5456/3477/files/10052802504.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/26443777516.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/wibezego.pdf
    • https://cdn.shopify.com/s/files/1/0431/0591/0935/files/norujaridesazodoga.pdf
    • https://cdn.shopify.com/s/files/1/0433/0402/6280/files/80582733165.pdf
    • https://cdn.shopify.com/s/files/1/0437/6503/9261/files/dikevanemiligolip.pdf
    • https://cdn.shopify.com/s/files/1/0437/1913/1285/files/81419490896.pdf
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/az_900t01_a_microsoft_azure_fundamentals.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/davem.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_off00005007.bin
31c7df36891c157a1ffd83d14e7aebc5dc72a98dc3cc1e6abcc90ba48bf2051f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5007 5216 bytes
font_01_sfnt_off000061dc.bin
b55864db23a4055631d29bbfbc620871adfa7721458384743866efad5c7ac816
pdf-font-stream PDF embedded font (sfnt) at offset 0x61DC 10264 bytes