Malicious PDF — malware analysis report

Static analysis result for SHA-256 613a1029e431637b…

MALICIOUS

PDF

40.6 KB Created: 2020-08-04 22:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f01de083d6105ecdb32b7ed7c321f41c SHA-1: dd99058502d039cf9e4877d8c2813cda2632c9c6 SHA-256: 613a1029e431637b9e206f21bd10b0885e60966ade9619ed0686b5b9aa5d9e06
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to link farms hosted on Shopify. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=asciidoctor+windows+pdf'. This suggests the document is designed to direct users to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links strongly indicates a malicious intent to redirect the user.

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.cc/pify?keyword=asciidoctor+windows+pdf
    • http://files.somdjuniorwrestlingleague.org/uploads/1/3/1/4/131408581/wetuxufi_ketogob.pdf
    • http://files.shannondrhodes.com/uploads/1/3/0/8/130873907/1944747.pdf
    • http://files.brittanyborman.org/uploads/1/3/0/7/130776370/9913297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8845/2515/files/juwavafi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6711/1584/files/82043227653.pdf
    • https://cdn.shopify.com/s/files/1/0432/1977/9741/files/craftsman_lt1000_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/2969/0525/files/63410539263.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/wolejufizonokulid.pdf
    • https://cdn.shopify.com/s/files/1/0434/3670/3900/files/how_to_search_through_imessage.pdf
    • https://cdn.shopify.com/s/files/1/0429/4184/1575/files/bobujakazu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/fuwonidobi.pdf
    • https://cdn.shopify.com/s/files/1/0429/2742/3654/files/49016409316.pdf
    • https://cdn.shopify.com/s/files/1/0438/5056/3734/files/13290992985.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/75133555211.pdf
    • https://cdn.shopify.com/s/files/1/0440/2541/3782/files/68144212312.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_off00006118.bin
d04fe0917e76d56ed9416965c8e6f813473d52c062d3b351c0897ba9392d2400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6118 4988 bytes
font_01_sfnt_off00007238.bin
da0686a791c06b8a69047b9d1cec7b836f1863957d806cbb4e8105b0f77dbbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7238 10364 bytes

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