Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a8fa5de9aa41721…

MALICIOUS

PDF

47.1 KB Created: 2020-08-10 03:55:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 94bc7c3aaa5dde319fad88b0689b82d0 SHA-1: b0b88015f6ee64553c14c124a3d14b6ca56544a7 SHA-256: 6a8fa5de9aa41721f47020210f4c976d424bee6ae38cf8a39602742703d12b5d
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to host other PDFs. One critical finding indicates a direct link to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used in conjunction with a lure for a 'handbook' PDF. The ML classifier also strongly flagged this PDF as malicious. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=oxford+handbook+of+clinical+pharmacy+pdf+free
    • http://files.moonlakedesigns.co.uk/uploads/1/3/1/4/131409244/0fe9ef15.pdf
    • http://files.katherinedolen.com/uploads/1/3/2/7/132740288/a66ee.pdf
    • http://files.candacegayle.com/uploads/1/3/0/7/130740573/2891096.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0916/0862/files/37647815786.pdf
    • https://cdn.shopify.com/s/files/1/0437/3898/8709/files/42205720429.pdf
    • https://cdn.shopify.com/s/files/1/0435/1832/8991/files/72763508806.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0840/files/12768887128.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/tofolag.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/chinua_achebe_the_african_trilogy.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/echo_gt-_225_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/northstar_pressure_washer_parts.pdf
    • https://cdn.shopify.com/s/files/1/0428/8725/0087/files/cannot_resolve_symbol_onclicklistener.pdf
    • https://cdn.shopify.com/s/files/1/0438/1320/8226/files/tunemokimesavowobifuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/word_update_all_fields.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/zofefolusigiwazimigolikas.pdf
    • https://cdn.shopify.com/s/files/1/0431/2141/0210/files/nubigapomura.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000612b.bin
8c9bdf26b264149f7d476f52fbb9f6ab39a81fc0d75ded059eb9981230da9454		 pdf-font-stream PDF embedded font (sfnt) at offset 0x612B 5616 bytes
font_01_sfnt_off00007422.bin
12b90a3255336b0e28c65e39404fca586c25a259aefc08bde8e26036d8f6330c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7422 10244 bytes
font_02_sfnt_off00009764.bin
c2afabfac982bb5a8fc9b07f5d8927a76e5841187da33abbd31a349b5bb8a61d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9764 16836 bytes

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