Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f0134ac5539675e…

MALICIOUS

PDF

48.6 KB Created: 2020-08-30 21:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3bb19060070e95c72a4a9919ef99776 SHA-1: a6a787af26b4aeaab37aa58e74e4b5f10ac3ffcc SHA-256: 6f0134ac5539675e3e9dd2d510f9b19b5a343903c0bfa564b2536f9c6f5e549b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL.

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.com/wix?keyword=interpersonal+communication+quiz
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/0256/7588/files/tugamevab.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1336/files/50193066736.pdf
    • https://cdn.shopify.com/s/files/1/0433/8978/0124/files/english_monthly_calendar_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2966/6724/files/fargo_script.pdf
    • https://static.usrfiles.com/ugd/ab922d_18cc36b6179841e3b46396bb6dea2710.pdf
    • https://static.usrfiles.com/ugd/b8c837_93dae03bf6514f08b27d70aaf29ecec3.pdf
    • https://static.usrfiles.com/ugd/9c0842_24f6d53fbc62469d8984fe968f7122cb.pdf
    • https://static.usrfiles.com/ugd/5bb01c_400b334388e641229dc5a8cd1f4294e1.pdf
    • https://static.usrfiles.com/ugd/2ac701_ab233687a2b740c5af2522fe8f5b13ef.pdf
    • https://cdn.shopify.com/s/files/1/0437/9721/7440/files/letowusesamifesafinevef.pdf
    • https://cdn.shopify.com/s/files/1/0433/6690/8054/files/bangalore_days_tamil_movie_songs.pdf
    • https://cdn.shopify.com/s/files/1/0433/7932/7137/files/50053837623.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/funuga.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/redisugaje.pdf
    • https://static.usrfiles.com/ugd/b0b521_acf0d84047194f12bc4e94032a341eda.pdf
    • https://static.usrfiles.com/ugd/ace02d_297000a23daa4264817e4f447a641d94.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a587703f38ce4b49b94caf287dca0583.pdf
    • https://static.usrfiles.com/ugd/08fe48_95c87aae75ad455e8497f916920635b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_02d3e4587d254423a7fbd95ea432ab12.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_off000073f3.bin
3c9476951fd84753bcb1ae1335e5637df81a6cfad173876c27974218b04d9ed5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73F3 5076 bytes
font_01_sfnt_off00008515.bin
75b7fbfc57d2c34f7ea74447cf2fc28151528e853860938f6717ac53de95f245		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8515 9892 bytes
font_02_sfnt_off0000a6e8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA6E8 4324 bytes

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