Malicious PDF — malware analysis report

Static analysis result for SHA-256 381fb5a71a5c89ae…

MALICIOUS

PDF

40.4 KB Created: 2020-09-01 07:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 320706b7c573b90d7cacef33e11e56cb SHA-1: 9fda3c9836372da7400cc8dff3de75fb0b223382 SHA-256: 381fb5a71a5c89ae17014cdaf4ccdfc3b8ab519a7cbcc4372213716cc6611e9d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lead the user to a malicious site. The document body also contains numerous links to Shopify-hosted PDFs, suggesting a link farm or SEO poisoning tactic to mask the malicious intent. The ML classifier strongly flagged this PDF as malicious.

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/wix?keyword=conjunctions+worksheets+english+for+everyone
    • https://cdn.shopify.com/s/files/1/0433/4315/1272/files/xewexugufuzemorawotudapaw.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/mathematics_printable_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0460/2272/1695/files/lutosobowajexonivalutajiv.pdf
    • https://cdn.shopify.com/s/files/1/0436/7928/5401/files/halo_online_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0439/1682/0648/files/cyberlink_media_suite_10.pdf
    • https://static.usrfiles.com/ugd/b8c837_a5b6b2e2ebab4cee956829f534e28626.pdf
    • https://static.usrfiles.com/ugd/dd6616_60445230278445bba4002580e2bca65f.pdf
    • https://static.usrfiles.com/ugd/865d50_95d1c9aceffa4c8f935ec63f91c36551.pdf
    • https://static.usrfiles.com/ugd/a31856_d0325210f53e46f1a961a9510d4ec3b1.pdf
    • https://cdn.shopify.com/s/files/1/0428/2132/0870/files/90942379239.pdf
    • https://cdn.shopify.com/s/files/1/0431/5794/6519/files/wavovu.pdf
    • https://cdn.shopify.com/s/files/1/0470/9797/0838/files/89192512397.pdf
    • https://cdn.shopify.com/s/files/1/0451/8638/4023/files/jezajumoxomiruvuvexeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/english_phonetic_transcription_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0427/6020/8540/files/jilizede.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/91180254071.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_off00005f65.bin
1352fc1d14a34a3d1e10d26f8d958bad75e6a37e253f0e70878125c1b0c4bf9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F65 5232 bytes
font_01_sfnt_off00007153.bin
4607ba3a331ec4e47abad10c2807a8fdef42a051adff8c96fec37ca0630005cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7153 10412 bytes