Malicious PDF — malware analysis report

Static analysis result for SHA-256 17869646939f2d80…

MALICIOUS

PDF

47.1 KB Created: 2020-07-31 14:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c6373a42669b10cf57bac0d098d59c8 SHA-1: fc1d8326901d74dfa0885d219f3401e490a20a36 SHA-256: 17869646939f2d80944d3c42835b268def54e3547af0f993531b64eae1a1a6af
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary link directing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the heuristic firings and the nature of the embedded links suggest an attempt to redirect users to malicious content, likely for SEO spam or phishing purposes.

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=california+fire+permit+pdf
    • http://files.kansascityamprepair.com/uploads/1/3/2/6/132695865/b89f1.pdf
    • http://files.swindonheritageblueplaques.com/uploads/1/3/0/8/130874587/1461531.pdf
    • http://files.thegoddessloft.com/uploads/1/3/1/6/131637178/424420a159c11.pdf
    • http://files.notjustwire.com/uploads/1/3/1/3/131398140/b7d488ef3ea.pdf
    • http://files.casaesperanzalongmont.org/uploads/1/3/1/3/131383297/valom_nivofumatis_wumegujapiwim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1753/3597/files/xalutu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/renowunozoxemuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2111/5298/files/56423383296.pdf
    • https://cdn.shopify.com/s/files/1/0437/6212/2903/files/disetivazusuwazogapukepuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/7584/5792/files/lawojatowinefekaruma.pdf
    • https://cdn.shopify.com/s/files/1/0428/4848/5535/files/dujebokiwovejubuve.pdf
    • https://cdn.shopify.com/s/files/1/0434/8284/1250/files/93684959698.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/bebovemelawoku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3089/files/daribobanelop.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3097/files/nelabagemivi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1125/2132/files/zunakeras.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/30423780886.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.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_off00007b17.bin
eeca798d0b90227c97a1508c967d273e692df0adb6c4804d9bda67dd07cda117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B17 4820 bytes
font_01_sfnt_off00008b5d.bin
1941607941c91157136716b6699060942fdcd30ebff878ef828693ad27c4d184		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5D 10484 bytes

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