Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca23f1739d6677c9…

MALICIOUS

PDF

43.9 KB Created: 2020-08-30 23:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 355e5812a5746db5318752c826d1c550 SHA-1: 26dab4948e0fd2454866aee97a54136d7f2692b4 SHA-256: ca23f1739d6677c9b4e0f0eb32cb080fae68f56837c7b8b13a05a09c6e7d4b31
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is disguised with a "love coupon template free" keyword. This redirector then leads to a link farm of numerous other PDFs, suggesting a campaign to drive traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=love+coupon+template++free
    • https://static.usrfiles.com/ugd/0c4177_7d98e62acb1a43179c4864ae65b0830e.pdf
    • https://static.usrfiles.com/ugd/b8c837_6dada1dcff33497a9e03ed2b0f4820b9.pdf
    • https://static.usrfiles.com/ugd/b8c837_161157c80ca949628ceda4d1d843ee1f.pdf
    • https://static.usrfiles.com/ugd/9e41f0_07033f81081a4df093cdb021a0e85784.pdf
    • https://cdn.shopify.com/s/files/1/0429/6087/9782/files/shear_force_and_bending_moment_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0435/8114/5243/files/jofeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/2372/7783/files/xijabudolariwigujeletoxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6378/8188/files/english_grammar_in_odia.pdf
    • https://cdn.shopify.com/s/files/1/0437/7142/9015/files/accountancy_book_class_12_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9823/4270/files/bujuzobedita.pdf
    • https://cdn.shopify.com/s/files/1/0438/9270/3384/files/evidentiary_foundations_cheat_sheet.pdf
    • https://static.usrfiles.com/ugd/82e28d_894d58c4d6524265ad4c4fb0ca96397a.pdf
    • https://static.usrfiles.com/ugd/1e32c2_07b627bbb77b4aa7b689f83ef6076f3b.pdf
    • https://static.usrfiles.com/ugd/ac72e0_2a7e6a4548f146bd884d7d4a821c230a.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_off000061ed.bin
9f5d50c92d5d34675d8894aaa59f4b2b7b2690ca3ee318b5831d0c320def6ada
pdf-font-stream PDF embedded font (sfnt) at offset 0x61ED 4820 bytes
font_01_sfnt_off00007241.bin
49564ab1f742a7e695cdd84dcd50033deaf0816683ad73c0c55e7a2581ed68b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x7241 10060 bytes
font_02_sfnt_off000094b0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
pdf-font-stream PDF embedded font (sfnt) at offset 0x94B0 4324 bytes