Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c415601dea172e1…

MALICIOUS

PDF

48.2 KB Created: 2020-07-31 11:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c59126ec84f39faefffafe2ecdb81de SHA-1: aee356ecba1924115da07d130bb07aab6a9177a6 SHA-256: 0c415601dea172e1d3ff81f7dc38f45e30f5106199c703760e887a6f9abc00ee
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to a 'mathematics formula sheet'. The presence of embedded URLs and the heuristic firings indicate an attempt to redirect users to malicious infrastructure, likely as part of a phishing or scam campaign.

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=mathematics+formula+sheet+pdf
    • http://files.artsourceco.org/uploads/1/3/0/8/130874210/4757712.pdf
    • http://files.myscarsministry.com/uploads/1/3/1/4/131437508/pizoli.pdf
    • http://files.northpalmbeachlife.com/uploads/1/3/2/7/132740873/naxipaneseluz.pdf
    • http://files.playwithfireproductions.com/uploads/1/3/1/6/131637640/7876238.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3444/1885/files/41998219261.pdf
    • https://cdn.shopify.com/s/files/1/0428/6778/5884/files/xojukeveposajapas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/70354855800.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/88895315386.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/nadizux.pdf
    • https://cdn.shopify.com/s/files/1/0428/7466/7164/files/vigeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/0333/7115/files/13243444646.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/3530116250.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/91165810277.pdf
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/devowogupivupuzodari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/21722927443.pdf
    • https://cdn.shopify.com/s/files/1/0431/1266/1152/files/ferasesikixigupufosogi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0933/files/pafemasinidoruzedobik.pdf
    • https://cdn.shopify.com/s/files/1/0439/6482/5758/files/89530564342.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_off000071e7.bin
810038b12afb3a94729df8d3ab00268531c2dab3534ae2f799b901568e3dc622		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E7 5176 bytes
font_01_sfnt_off00008381.bin
492f55e85aa1198c8e0160771495b2e79fc9b5fbea13edee8d7705ff1017a856		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8381 15436 bytes

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