Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0f7e0e784d760d…

MALICIOUS

PDF

59.9 KB Created: 2020-07-27 14:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25acb002d51293caddedc7895afe6276 SHA-1: 4bc5ef306bb9887c6dcd6a1384adf899b2e8eda1 SHA-256: 1f0f7e0e784d760dd6b4a2b22724b0e2646df28f263e2c1b17287b4a08255fa8
154 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Vs code c format style', suggesting a lure to attract users interested in programming tools. The ML classifier strongly indicates 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.cc/pify?keyword=vs+code+c+format+style
    • http://files.fortheloveofdogsrescue.org/uploads/1/3/0/7/130740530/4bbb2239b43.pdf
    • http://files.elisalorello.com/uploads/1/3/0/8/130814535/navovuriniju.pdf
    • http://files.alpharettafilmacademy.com/uploads/1/3/1/8/131871416/9627208.pdf
    • http://files.prrofe-olmos.com/uploads/1/3/2/7/132712080/zajobufuganuner.pdf
    • http://files.janellesmithnutrition.com/uploads/1/3/1/6/131636682/pojebepipikixap_xedopake_xokirajabejarok_novako.pdf
    • http://files.elisalorello.com/upl
    • https://cdn.shopify.com/s/files/1/0438/4371/5229/files/86313800274.pdf
    • https://cdn.shopify.com/s/files/1/0437/7578/7162/files/filovutipubesazudipe.pdf
    • https://cdn.shopify.com/s/files/1/0434/5564/3809/files/88221022918.pdf
    • https://cdn.shopify.com/s/files/1/0437/8152/1565/files/47437997235.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mowojemabedeju.pdf
    • https://cdn.shopify.com/s/files/1/0430/9286/9281/files/6459340931.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/dogezafefaverapubit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/21884581804.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagesagebog.pdf
    • https://cdn.shopify.com/s/files/1/0430/4257/0402/files/59553533267.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/74232911661.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b36.bin
aff11289bf87f92bc53c0e2abc335208e29b6db8a954e82fd0a5595ffa95d344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B36 2880 bytes
font_01_sfnt_off00008574.bin
958f5746889ca9690666faf1a057d0b20d21cc625bea6cb8f80d3714eec4bbcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8574 4868 bytes
font_02_sfnt_off000095fa.bin
9fcfd2b2c12c9d480c0beec3ee39f05b9e518edc5177a7a5fcc68dff0371f8a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95FA 2092 bytes
font_03_sfnt_off00009f9b.bin
a877ada21f0dceccf26cb596d5b3c88e860d1598eae79fa2efa2158c82ac0551		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F9B 13200 bytes
font_04_sfnt_off0000cac9.bin
a135263e580b37783386919550bd3615eb0c1d298649e1385b630d376a05c213		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 16524 bytes

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