Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d2590c7894d306…

MALICIOUS

PDF

41.1 KB Created: 2020-08-31 05:01:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b16b2e7e2461fb55e9aa661d6dbca75 SHA-1: 186f9a718e4af50ce14a9e21131306de851d1fd4 SHA-256: 36d2590c7894d306830895bdf0893ed7c91501d42a611ed01eb775631971a0e0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/wix?keyword=pcgs+price+guide+indian+head+cents, which is likely used to lure victims into clicking through to a malicious site.

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=pcgs+price+guide+indian+head+cents
    • https://static.usrfiles.com/ugd/eb4c03_d56a908175e14e63abf12690a2ec36aa.pdf
    • https://static.usrfiles.com/ugd/912de2_dddf5ac349bc47349fbc99e337d73c7c.pdf
    • https://static.usrfiles.com/ugd/0c41e7_d52b1d1223ee4f0785a1c35717103b49.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5cb405eec374da292893a431cdc0498.pdf
    • https://static.usrfiles.com/ugd/5af86b_7c53dabbe8254f5d99acbf16726b951d.pdf
    • https://cdn.shopify.com/s/files/1/0430/8228/5216/files/entrepreneurship_development_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/4222/5832/files/pagimezagojir.pdf
    • https://cdn.shopify.com/s/files/1/0434/0622/9654/files/diet_keto_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0431/0355/1645/files/greeting_card_template_word_2003.pdf
    • https://cdn.shopify.com/s/files/1/0439/9818/3582/files/negawusanuxuze.pdf
    • https://static.usrfiles.com/ugd/80c1db_e8d5556fe88b48b0ba6daaa5d9712afc.pdf
    • https://static.usrfiles.com/ugd/299074_4bb709d51ec045aca5c25d850ae2eda2.pdf
    • https://static.usrfiles.com/ugd/05301a_15c8a0880761468d8061bca32da681f1.pdf
    • https://static.usrfiles.com/ugd/ed64d2_cdf5bde5d6664df1ae5806cc832008b5.pdf
    • https://cdn.shopify.com/s/files/1/0451/1475/3189/files/sad_anime_songs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/80422054872.pdf
    • https://cdn.shopify.com/s/files/1/0437/9328/5277/files/vaxabagimadewumopego.pdf
    • https://cdn.shopify.com/s/files/1/0438/6252/4069/files/together_with_accountancy_class_12_solutions.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_off0000598c.bin
d9fbf11efd5fb8194ff4eaf6a8bce63eeb872e7f9f20a1c77b0e1e3417ec8481		 pdf-font-stream PDF embedded font (sfnt) at offset 0x598C 5304 bytes
font_01_sfnt_off00006b89.bin
52f2f7f85fd7ec05d8e5a3f38d00fa17f811d992d66c4b4572bfef26603e5f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B89 13708 bytes

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