Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b440a9ddf06547…

MALICIOUS

PDF

57.1 KB Created: 2020-09-03 22:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d12a64bf816313af48c27c2cb38f8b55 SHA-1: 360d230a661ecd905906b0485a00720020605fc8 SHA-256: c4b440a9ddf065476a84556fcdedf79abd4346500b3c5c2364f0b7acb4ce0734
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, pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains text fragments suggesting it's a lure related to 'Galmed pharmaceuticals annual report'. The presence of numerous external links, many hosted on Shopify, indicates a link farm strategy, likely to obscure the malicious destination.

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/wix?keyword=galmed+pharmaceuticals+annual+report
    • https://cdn.shopify.com/s/files/1/0434/6698/1542/files/zosekoko.pdf
    • https://cdn.shopify.com/s/files/1/0446/3240/8227/files/fur_elise_piano_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/2383/4011/files/84607646316.pdf
    • https://cdn.shopify.com/s/files/1/0438/4922/0256/files/aquaculture_engineering_journal.pdf
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/7_seeds_ending.pdf
    • https://cdn.shopify.com/s/files/1/0433/0291/2168/files/95264232521.pdf
    • https://cdn.shopify.com/s/files/1/0434/6960/2981/files/riddle_school_4_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0450/1677/6862/files/nitracion_de_acetanilida.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/wewepav.pdf
    • https://cdn.shopify.com/s/files/1/0428/7044/0095/files/lipop.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8404/files/magenta_pixie.pdf
    • https://cdn.shopify.com/s/files/1/0446/0884/8035/files/deadpool_kills_the_marvel_universe_1_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/6993/9612/files/viganusowezet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5498/0505/files/50099145716.pdf
    • https://cdn.shopify.com/s/files/1/0434/8716/6628/files/virutigixopaduku.pdf
    • https://static.usrfiles.com/ugd/b8c837_d38ddbb468934632b2c0b4658c6776b2.pdf
    • https://static.usrfiles.com/ugd/96768c_3ee4c99bd20a463483b6d298292b7ac2.pdf
    • https://static.usrfiles.com/ugd/b371d9_7823855679fe42f492f49c02c1d51d96.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000088a0.bin
a841585926925b84256c5236fdcb1a5fb70e0b4c67f67c657225f551cee35197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88A0 5228 bytes
font_01_sfnt_off00009a38.bin
be348a22fe190728f1d360d8e10ea682a14f6dd4ddd02d80d69c8b9c0587fdb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A38 1972 bytes
font_02_sfnt_off0000a3af.bin
764e929a316ced38bfb4084b390d9ac09fa915c44bef7c941ccab4b64f5fbd19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA3AF 10680 bytes
font_03_sfnt_off0000c831.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 4324 bytes

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