Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a4c5edd8064f42…

MALICIOUS

PDF

46.7 KB Created: 2020-08-03 13:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c183d47f9f0844072a14728d62f8e1d SHA-1: 6d408535d856b321b7baa58e38e274b0e4b8a277 SHA-256: 73a4c5edd8064f42812d02741442daba388fe8bbdf9a9c43fa7ddc13758f0470
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the URL and appears to be a lure related to automotive actuators. The presence of multiple PDF links, many pointing to Shopify, suggests a link farm or a method to obscure the final malicious destination. The ML classifier also 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.cc/pify?keyword=tipos+de+actuadores+automotrices+pdf
    • http://files.dogworksc2.com/uploads/1/3/1/8/131871488/fuzunijobuki-fekawujufep-tewudaxelus.pdf
    • http://sufugefod.actionpestnm.com/uploads/1/3/1/3/131384284/fegibexetemore-gidoru.pdf
    • http://files.ibiogen.eu/uploads/1/3/1/4/131406433/3822147.pdf
    • http://files.nasiiclothingstore.com/uploads/1/3/2/7/132710592/tobigetepopalaje.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3863/7208/files/fraction_in_latex.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/xepini.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/22897150934.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1770/files/17960120328.pdf
    • https://cdn.shopify.com/s/files/1/0437/0323/8811/files/vavafafakanaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/92702877098.pdf
    • https://cdn.shopify.com/s/files/1/0432/2358/0831/files/vibegize.pdf
    • https://cdn.shopify.com/s/files/1/0434/8795/3053/files/4748622817.pdf
    • https://cdn.shopify.com/s/files/1/0434/5187/5494/files/vixonolofagenofusavejasav.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/tadujutabewiwojewanokat.pdf
    • https://cdn.shopify.com/s/files/1/0437/6310/5949/files/zomowuzuwisomofutilejazog.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_off000076c8.bin
9212e97f05270ab1bf7972ea7b07673edcab648b9b7226d06177f162aa8a90bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C8 5220 bytes
font_01_sfnt_off00008872.bin
47503b18e193f0e641596b75f02d9e224de4213b0fea68cd6f9270e8a39013e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8872 11020 bytes

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