Malicious PDF — malware analysis report

Static analysis result for SHA-256 71350f0a5efd0ec8…

MALICIOUS

PDF

44.4 KB Created: 2020-09-01 15:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b1864db911e998368520689ff59e7fb SHA-1: 4313774ccebf1e1571cc3443dd4d78e926ca454e SHA-256: 71350f0a5efd0ec8626850db7faf7a5a844d4d5e2c970d7a74b5405ddb080894
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, identified as a link farm, with one prominent link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL and keywords related to the link, suggesting a lure to entice users to click. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links to external PDFs and a malicious redirector indicates a likely attempt to lead the user to a malicious site or download further malware.

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.me/pify?keyword=gi+sheet+weight+in+kg
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_dea0e0c5fb644b17acdc26d373103ee2.pdf
    • https://static.usrfiles.com/ugd/d54300_9ff943f4636d4074af62d02845129216.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_7602e2724ff74838a5ce8f154bd88ef0.pdf
    • https://static.usrfiles.com/ugd/52b593_738ded4d14ae4b3a873f62d96e4abfd6.pdf
    • https://static.usrfiles.com/ugd/cf79db_5e8722d1084843fdbafa43ace13fa8f2.pdf
    • https://static.usrfiles.com/ugd/c6ac46_3051f9b1cefa4456a5db94ae54970109.pdf
    • https://static.usrfiles.com/ugd/50c35f_b6b346c871c34990998d8feb4525592d.pdf
    • https://static.usrfiles.com/ugd/43d598_75c6f00f78b14d9882b66c8fde5f212b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c28141f139f4963a7afeef6ed5cd7e6.pdf
    • https://static.usrfiles.com/ugd/ee6770_7fa4613835f148d89c6e5081e3d12404.pdf
    • https://static.usrfiles.com/ugd/73c254_a71235ecc18044688ad0edba3623159c.pdf
    • https://static.usrfiles.com/ugd/93971e_796ce8b44c3f4ef39bed420925b16d16.pdf
    • https://static.usrfiles.com/ugd/81d6a4_c6a9fcca74cb46659f59445060445e36.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5830/files/itunes_for_android_box.pdf
    • https://cdn.shopify.com/s/files/1/0449/7873/3224/files/20521212990.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15796621189.pdf
    • https://cdn.shopify.com/s/files/1/0433/4492/0734/files/62614675033.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006483.bin
ac3eefe9481e8c0b1c61b3e97bea1bc8c60ab5726aab5d771b9747c6886f44d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 4476 bytes
font_01_sfnt_off000073c2.bin
7860dc3b99f75f9fdeb5b161b824176f913f0d8d90e66e9950a942f974877b02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C2 10220 bytes
font_02_sfnt_off0000968c.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x968C 4324 bytes

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