Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a97404994a484e…

MALICIOUS

PDF

46.2 KB Created: 2020-08-06 06:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12839bfcec85f652e649a47dce74322c SHA-1: 00630e720d928b0217d78852a645ba5856006c4f SHA-256: a4a97404994a484e9a26da07d106750262e18aba472c9ff3104f1e00e67b5460
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=social+media+definition+pdf+journal', suggesting a lure related to academic or social media content. The ML classifier 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.com/pify?keyword=social+media+definition+pdf+journal
    • http://files.hsc3knives.com/uploads/1/3/0/9/130969243/a00465f049b.pdf
    • http://files.fivelakescabinetry.com/uploads/1/3/2/6/132681969/2556215.pdf
    • http://nuwifotul.pulaskicadets.org/uploads/1/3/2/7/132740541/tekok-rasuzoberekeve-sedetixedu.pdf
    • http://files.appalachianmountainguides.com/uploads/1/3/2/6/132681026/52aa57f852640c.pdf
    • https://cdn.shopify.com/s/files/1/0430/8706/9348/files/lepumibakadegedivazuvamav.pdf
    • https://cdn.shopify.com/s/files/1/0448/4333/5837/files/analytical_chemistry_7th_edition_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/sazarepekafumufesa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/vibufebevofasirapuviw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/trumpet_solo_jazz.pdf
    • https://cdn.shopify.com/s/files/1/0433/7546/0515/files/rabuxafimu.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/wuwaravuxibevuwafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/dental_biomaterials.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/nowixibenosokam.pdf
    • https://cdn.shopify.com/s/files/1/0433/8355/4202/files/tratamiento_retinopatia_hipertensiva.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50398535586.pdf
    • https://cdn.shopify.com/s/files/1/0433/5439/0687/files/jovupedejokakul.pdf
    • https://cdn.shopify.com/s/files/1/0432/6260/7518/files/54883582978.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007803.bin
9c1e4082370a963757e3ddb7eb0c5ae7fb3af7fb072f07c343df3ab77e917e92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7803 5300 bytes
font_01_sfnt_off000089fe.bin
2e62f8200e975c5783d1e081968437a89537f1c591c067fdd8d63ec8d345d929		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89FE 9920 bytes

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