Malicious PDF — malware analysis report

Static analysis result for SHA-256 170a344ed57820af…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 11:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af629febfb0281ee35a613a53af9b8d3 SHA-1: 0dca9b70ed5f3fcc73afbfb238111820e248af1f SHA-256: 170a344ed57820af8f1c54e308a65b522a955d64094160b0a27f1bcb9680740d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one pointing to a known malicious redirector infrastructure (ttraff.ru). The document body, though heavily obfuscated, contains a reference to this malicious URL, suggesting an attempt to direct users to harmful content. The presence of a large number of external PDF links further supports a link-farming or redirection-based attack pattern.

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=2k17+free+download+android
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/3581/9173/files/99592991943.pdf
    • https://cdn.shopify.com/s/files/1/0435/3038/7607/files/ugandan_gospel_songs_2018.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/datuvazukazor.pdf
    • https://cdn.shopify.com/s/files/1/0448/4133/6989/files/36521437653.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/53824884534.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8567/files/93264705782.pdf
    • https://cdn.shopify.com/s/files/1/0434/8647/8489/files/zaburzenia_psychiczne_dzieci_i_modziey_gmitrowicz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/kagikuxuli.pdf
    • https://static.usrfiles.com/ugd/3f0e57_8c5087087de8425f85ff1df10111caa1.pdf
    • https://static.usrfiles.com/ugd/a91264_4d27c797278c4ec0bfa54d2ed4d286c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f066c0bc46c47048f988b9d4575c723.pdf
    • https://static.usrfiles.com/ugd/88a84f_a74e994e6e864d88846eb31d49dfb3f2.pdf
    • https://static.usrfiles.com/ugd/09c3c7_ae547fe69d10477abec2a66d9f8f4931.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/93821712680.pdf
    • https://cdn.shopify.com/s/files/1/0438/4748/3557/files/autodesk_inventor_2019_handbuch.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c9b.bin
b4f627aae86215efbbe3007645614af9c7a0954c7e651691c08c93104b193f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C9B 4756 bytes
font_01_sfnt_off00006cdb.bin
bfc7747fe16e361031de4aa0bb4948ad2eb823d02381791d98904f1bef5165c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 10236 bytes
font_02_sfnt_off00008ff1.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FF1 4324 bytes

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