Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf791c8c4b6b5c1…

MALICIOUS

PDF

50.2 KB Created: 2020-08-02 10:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f408dd10fe47163a81f5235d9908268d SHA-1: e49c969b41644c48f3b9654096a00bc6a3a6db24 SHA-256: dbf791c8c4b6b5c123298a32fb2a511cecacb808c8788b3f88415af9f1656524
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. The primary malicious URL, https://ttraff.cc/pify?keyword=ruby+copy+file, is identified as a known malicious redirector. This suggests the document's purpose is to lure users into clicking malicious links, likely leading to further compromise. 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.cc/pify?keyword=ruby+copy+file
    • http://files.jeanbeanart.com/uploads/1/3/1/4/131437018/lisesemu-superi.pdf
    • http://files.jgirello.com/uploads/1/3/0/8/130873951/c48f8f73f9ce38.pdf
    • http://files.baileysandouille.com/uploads/1/3/1/4/131407493/xenaz_xizotijuzel.pdf
    • http://files.dubrovnik-coast.online/uploads/1/3/1/6/131606268/lamatulajolodepunat.pdf
    • https://cdn.shopify.com/s/files/1/0440/8652/6102/files/wozuxugisariviwokulifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/91077284378.pdf
    • https://cdn.shopify.com/s/files/1/0434/5511/9512/files/rekafugawowu.pdf
    • https://cdn.shopify.com/s/files/1/0430/9758/7861/files/gupusumuvojivozejegexome.pdf
    • https://cdn.shopify.com/s/files/1/0437/2506/2298/files/zulowipetafatemam.pdf
    • https://cdn.shopify.com/s/files/1/0433/2906/1014/files/66456766611.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/tuduw.pdf
    • https://cdn.shopify.com/s/files/1/0431/8016/3227/files/lerigavifisunewusuzimepef.pdf
    • https://cdn.shopify.com/s/files/1/0432/3262/4808/files/87922691940.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0435/2815/9396/files/sevedoramozawuvemunedanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/3626/2052/files/luba_hegre_p_hub.pdf
    • https://cdn.shopify.com/s/files/1/0434/3077/2901/files/gevomo.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1919/files/jilediko.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_off0000871d.bin
54b3ff717d11e370b6ed8b37a96812be86c779f376bbb221aeb0f5a7558a2dba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871D 4776 bytes
font_01_sfnt_off0000978b.bin
4f57fb9ccbddc29b38c9bef53f557c8347bc666b19f45af18d43ce48e2794506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x978B 10728 bytes

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