Malicious PDF — malware analysis report

Static analysis result for SHA-256 c346bc7ae0005f2c…

MALICIOUS

PDF

46.2 KB Created: 2020-09-07 01:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f3e68934752a2d34ac466187aa25f26 SHA-1: 6f1965a65b73dfa635b17321c291187a9157e0ce SHA-256: c346bc7ae0005f2c3a8cbe33a2ce9d8b316fd85e0ee4dd9a3607451716e3cecf
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier also strongly flagged this PDF as malicious. The primary malicious URL identified is https://ttraff.club/pify?keyword=eeo+reporting+requirements+2019, which likely leads to further malicious content. The document also contains a large number of external PDF links, many pointing to static.usrfiles.com, suggesting a link farm or SEO manipulation tactic.

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.club/pify?keyword=eeo+reporting+requirements+2019
    • https://static.usrfiles.com/ugd/e33828_7fc1a629d5d24ef5b9950fe5e35ae7c8.pdf
    • https://static.usrfiles.com/ugd/9c66ff_7b46fbdb2b5344188dd27e2579937cd6.pdf
    • https://static.usrfiles.com/ugd/bc79a4_bd595f5dccb8427f8e170e8938b616a1.pdf
    • https://static.usrfiles.com/ugd/2f8cea_0de763e7cfe84e3bb48147b55466599b.pdf
    • https://static.usrfiles.com/ugd/374ce0_5c39e474e2a143059aea498bdd897d0b.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a3ad819ca7040918230151a692985cc.pdf
    • https://static.usrfiles.com/ugd/0c8cc8_6c8af26355904662bdcb63b8cb47074c.pdf
    • https://static.usrfiles.com/ugd/bf07b1_9276a7cb4d024b81879c247d15cabb73.pdf
    • https://cdn.shopify.com/s/files/1/0435/2439/1067/files/free_booklet_design_templates_word.pdf
    • https://cdn.shopify.com/s/files/1/0451/0456/2328/files/antiacidos_en_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8236/6629/files/52185441442.pdf
    • https://cdn.shopify.com/s/files/1/0434/2733/2245/files/72315247034.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5895/files/45401126706.pdf
    • https://cdn.shopify.com/s/files/1/0435/5221/1099/files/rirafatukigab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2007/4663/files/bokadewomamedemoken.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0262/files/55833013310.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006887.bin
62ae4f9254b3d7f7a060b38ad76a561e78522cd4d62c808aa391345fc1dc9272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6887 5344 bytes
font_01_sfnt_off00007aa2.bin
bdb2fd817118d0e90ae9f0f4f13c25617f3e95457fd52b327847034b4fe754b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA2 10248 bytes
font_02_sfnt_off00009dac.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DAC 4324 bytes

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