Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ea306ca6db62a4…

MALICIOUS

PDF

39.8 KB Created: 2020-08-21 06:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dfd3d5e9e4126b65bfd5600b7c741024 SHA-1: f0dc4b8f12772815e8af2981eebd585e08bf650e SHA-256: 77ea306ca6db62a42c24ee819196ad4a7bb93557cc0b9b99a1c65eeb4502e9d4
154 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and embedded URLs, including the primary malicious redirector at 'https://ttraff.ru/pify?keyword=b+team+theme+song'. This suggests the PDF's primary purpose is to lure users to malicious sites.

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.ru/pify?keyword=b+team+theme+song
    • http://tibew.absipartnership.org/uploads/1/3/0/9/130969950/tibigokodusinexisu.pdf
    • http://files.belladesgagnes.com/uploads/1/3/1/3/131398010/nufasimuzo_nozefediwibom.pdf
    • http://files.evaatkinson.com/uploads/1/3/0/8/130874541/totovala.pdf
    • http://zopujegoj.sunrisestudioseh.com/uploads/1/3/1/3/131380213/pajuzewodukipivizu.pdf
    • https://cdn.shopify.com/s/files/1/0438/9208/0795/files/tafixilesesesuzumixojonex.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/al_ghazali_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/2594/8072/files/unduh_vidmate_apk_versi_lama.pdf
    • https://cdn.shopify.com/s/files/1/0431/7931/1268/files/junefowimufameken.pdf
    • https://cdn.shopify.com/s/files/1/0429/3486/1991/files/48014614987.pdf
    • https://cdn.shopify.com/s/files/1/0430/8244/9045/files/retirement_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7661/files/xuxujagororinum.pdf
    • https://cdn.shopify.com/s/files/1/0438/6599/7472/files/23811622517.pdf
    • https://cdn.shopify.com/s/files/1/0430/7920/5013/files/94455280739.pdf
    • https://cdn.shopify.com/s/files/1/0428/2040/3356/files/fundamentals_of_communication_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0432/9717/7768/files/cad_soft_tools_to_dwg.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005174.bin
81a93281867f93683e2c6c5f6b27def0dfba6f3f6e71d6601da75a35f97b1d45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5174 4760 bytes
font_01_sfnt_off00006173.bin
1f72acffa02a2cf16658a772c3a82fc425147a0fabc5f8e475c7ceabf8c9681c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6173 10192 bytes
font_02_sfnt_off0000844c.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x844C 4324 bytes

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