Malicious PDF — malware analysis report

Static analysis result for SHA-256 792a10374e120014…

MALICIOUS

PDF

38.1 KB Created: 2020-09-08 20:26:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0630557348f04fa16a9f99588e319b44 SHA-1: e57b7bcd795a173b674e3fb06a1b626c669b71ac SHA-256: 792a10374e1200146730ce7f417237093afd96db64355071ff81df88fc3b5113
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.me'. It also exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on 'static.usrfiles.com'. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent. The embedded document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, reinforcing the link farm and redirection attack pattern.

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/wix?keyword=candy+shop+song+hangover
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/35dc59_0640293909b44540bc8f5729ae7ec92d.pdf
    • https://static.usrfiles.com/ugd/469aea_7340b53d6f0949f7808b306f48bf9ea3.pdf
    • https://static.usrfiles.com/ugd/77d535_4cc7d73249074d6c8bc39d6d190219c5.pdf
    • https://static.usrfiles.com/ugd/decf6f_9407ddfbb4cd4503ae8196b4fa21b5cc.pdf
    • https://cdn.shopify.com/s/files/1/0457/9439/4278/files/discover_english_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/6447/5304/files/63779710546.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/verb_tenses_exercises_multiple_choice.pdf
    • https://cdn.shopify.com/s/files/1/0439/3913/5643/files/cheap_thrills_sia_video.pdf
    • https://static.usrfiles.com/ugd/afbef4_05f597a6236b4dc2bdcdcb831fe5d636.pdf
    • https://static.usrfiles.com/ugd/b4f0c6_a295f4dd8fa544aeb08dbb2cd4eb6ec8.pdf
    • https://static.usrfiles.com/ugd/115d6e_c28131e3ee234d19807c36bf5e0db9c2.pdf
    • https://static.usrfiles.com/ugd/80c1db_cf2f23e12aa044b8866177e9c2683704.pdf
    • https://cdn.shopify.com/s/files/1/0429/9191/1066/files/diderevijarudijazol.pdf
    • https://cdn.shopify.com/s/files/1/0435/5915/7921/files/no_1_autographic_kodak_jr_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/fozupupidu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jokesinoximirupabujikupoj.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_off00004b70.bin
02708c89d9524f72549e5145ebd73aad3d0d041de023a99b9e34022e3f1888b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B70 5032 bytes
font_01_sfnt_off00005c81.bin
28b871d19fb223f6e10ec7f2a18556fe067b40fd1ce9fe27f363daac14679b13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 9876 bytes
font_02_sfnt_off00007d5e.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D5E 4324 bytes

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