Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5097c79fc50bd9…

MALICIOUS

PDF

38.0 KB Created: 2020-08-02 23:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e205c46bb6ce2ec28db644e534ff4b8e SHA-1: e18b974923d78b89bafd31432e17f9fecb0d1400 SHA-256: be5097c79fc50bd9c18f550cd128860d8bccc918efacf63751e342f101743f7e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm, with one prominent URL pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the same redirector URL and appears to be a lure. The primary attack pattern involves redirecting users to malicious sites.

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/pify?keyword=family+guy+ding+fries+are+done
    • http://files.personalizedbyemily.com/uploads/1/3/1/1/131164100/pidajaju.pdf
    • http://files.tritonchicago.com/uploads/1/3/1/3/131380786/9083271.pdf
    • http://files.haralsoncountyhistory.com/uploads/1/3/2/3/132302913/4438840.pdf
    • http://files.iondanceacademy.org/uploads/1/3/0/9/130969548/jitodonifuzujiwov.pdf
    • https://cdn.shopify.com/s/files/1/0434/0000/3747/files/separajigenanonajan.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/7350615236.pdf
    • https://cdn.shopify.com/s/files/1/0437/7329/6801/files/jawusewuva.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/popular_pizza_toppings.pdf
    • https://cdn.shopify.com/s/files/1/0438/9116/3291/files/dav_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/82748378135.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/60135679258.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/50429410688.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/19657841504.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/80073206077.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_off00004a62.bin
2177037bd0512b63a5a9ad7fb049175d658159831c43df8fd53760557c112612
pdf-font-stream PDF embedded font (sfnt) at offset 0x4A62 5084 bytes
font_01_sfnt_off00005b95.bin
c8c4dc15abd34b04900089c8deac2cdb6be253ac2e074dfbd0a7e282ef531f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B95 9828 bytes
font_02_sfnt_off00007d3e.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D3E 4324 bytes