Malicious PDF — malware analysis report

Static analysis result for SHA-256 4431aff77a400db9…

MALICIOUS

PDF

66.5 KB Created: 2020-09-02 14:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f0e5ce305b684e1bad8103e22f38444c SHA-1: 2b70b2084e60e3c95df05c9b2f0a2ac1fa91c495 SHA-256: 4431aff77a400db92eaaa8d7f165440f4823c6bc04e99b4ae2401fd36acbfc55
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links pointing to a known malicious redirector infrastructure, specifically 'ttraff.me'. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'journal el khabar pdf'. The presence of numerous external PDF links further suggests a link farm or redirection tactic. 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.me/pify?keyword=journal+el+khabar+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/6fd45c_34ef6997ceb844059674e4b81da787e6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b80405_9d5691ac5be14963b1d8505f3f7a99cf.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/253000_8f8967792c98440ebd84931acc5b552d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/02beb7_e505d19bebff41a999ddcbcdb2ae4729.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1b8612_6b7cc5b87c3d45f489e8eb05499e6104.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b88e3d_b1d99cf29a33484bbb3b5a232f247553.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/565485_32b7ccf51ce54a119933207bb9548318.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/3aee12_89443f8e4a094a429b54712dd4f4eef8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_893b824729e540a7a7df4385467bf7b6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f34323_ef6202868d9d4e089c753acf8de4e9fb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/89c6ad_e8c86e99321c45a8b4459babb63f7541.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eaf48f_e0cd0439d23d4ccc98778c5b9ad37241.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_6065188ab8e34fb9ba84f9bcf177a299.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8e1900_5c7c5d54b5cb4a689f76815942610511.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_61bad3644f934a5d853a47703719c7e6.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA7FD 5144 bytes
SHA-256: 42bd684eff903a17ac14d21d17ca81a664c84a15bb7a00183472058a5284fc29
font_01_sfnt_off0000b970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB970 13664 bytes
SHA-256: 4f9d768d81cb5d41ab837ae9696887f893e12df23df0bf4f08f3ed132b72d453
font_02_sfnt_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 16524 bytes
SHA-256: 254df97a403785a08d93f1b87e87b0557a0b5ae79f73648a3d5367d8bd9b5cac

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