Malicious PDF — malware analysis report

Static analysis result for SHA-256 678efe83540c92c5…

MALICIOUS

PDF

36.9 KB Created: 2020-08-12 03:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13a2ad813b2ceb21ca95ef61c9bc0751 SHA-1: 0e55a6aa91765778db38f251d85592cdb3889248 SHA-256: 678efe83540c92c5ecbb3c64efd6aba0c2c48ba6ed0c004e965e6c5941502130
154 Risk Score

Malware Insights

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

The PDF contains embedded links and text that attempt to masquerade as a 'Bilstein catalogue pdf'. One of the primary links directs to a known malicious redirector, 'ttraff.com', which is likely used to obscure the final malicious destination. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO abuse tactic.

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=bilstein+catalogue+pdf
    • http://jotigej.stickittothestigma.com/uploads/1/3/1/3/131382406/zozefefuf.pdf
    • http://files.goodweathermusicschool.com/uploads/1/3/2/3/132302749/2115744.pdf
    • http://files.destinationally.net/uploads/1/3/1/4/131408245/mobuvipo-vigamesijitufa-xatumitotifivod-foxuxakisopa.pdf
    • http://zalanenaz.whatnowlifecoaching.com/uploads/1/3/0/8/130874655/fujudezojewa-zegilomiraruma.pdf
    • http://files.preservetennis.com/uploads/1/3/0/9/130969469/gejuxig_nazuwojilapemi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3759/6575/files/accurate_scope_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/26512844574.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/bewonelepebikenim.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/8910956560.pdf
    • https://cdn.shopify.com/s/files/1/0432/4609/2443/files/fezogamilarede.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/33859494821.pdf
    • https://cdn.shopify.com/s/files/1/0437/6068/1111/files/voyager_trike_kit.pdf
    • https://cdn.shopify.com/s/files/1/0436/3298/4222/files/90221325465.pdf
    • https://cdn.shopify.com/s/files/1/0433/2932/3158/files/piguxujewixujag.pdf
    • https://cdn.shopify.com/s/files/1/0437/7670/4664/files/jspdf_autotable_header_height.pdf
    • https://cdn.shopify.com/s/files/1/0428/9665/4489/files/balancing_chemical_equations_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/57426121224.pdf
    • https://cdn.shopify.com/s/files/1/0439/0223/8875/files/55900524806.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000503a.bin
82aad6a25fbd2f3276fd90f8c6de2d814c95747d9c8c0f440ab8c1f178a9132a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x503A 5276 bytes
font_01_sfnt_off0000623c.bin
ad0e7649128fd087bde36ae86a3651fdf925913ddda3c2c5233c2118c7d27e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 10628 bytes

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