Malicious PDF — malware analysis report

Static analysis result for SHA-256 7168cbcea7ff1ff2…

MALICIOUS

PDF

66.2 KB Created: 2020-08-04 00:49:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44d794d87e363d044be3bdf7f45edf3e SHA-1: 16fc76e493cdf68b93f743036be64cc2a074cd76 SHA-256: 7168cbcea7ff1ff256effb6cc759c34c4f489053f36b232224c4499c523c7a44
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=blast+furnace+iron+making+process+pdf'. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous external links and the identified malicious redirector strongly suggest an attempt to lead users to malicious content.

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.ru/pify?keyword=blast+furnace+iron+making+process+pdf
    • http://files.forestburgumc.com/uploads/1/3/1/3/131381363/fovimoxebudeduz_dasodubamimit_sozuxapuki_kofomaditados.pdf
    • http://files.ambricemiller.com/uploads/1/3/1/4/131483148/7312147.pdf
    • http://files.la-manche.co/uploads/1/3/1/4/131483138/409f0e.pdf
    • http://files.arewordinglife.com/uploads/1/3/0/7/130739155/fifazewej_nokuda_kimib_wajemiw.pdf
    • http://files.cruzphotography.co/uploads/1/3/0/8/130815137/dorevirovumimo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73470001672.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/nodadowezofu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/xavitojavegojisidibibe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/99998149827.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/nadodedebufoxubisazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1778/0896/files/finelan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/diludenavopole.pdf
    • https://cdn.shopify.com/s/files/1/0438/1127/4914/files/68903712160.pdf
    • https://cdn.shopify.com/s/files/1/0433/3525/4171/files/42914471090.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/dupejufebol.pdf
    • https://cdn.shopify.com/s/files/1/0433/2558/7609/files/99581590161.pdf
    • https://cdn.shopify.com/s/files/1/0432/2725/0848/files/ganoluri.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/naxejavowij.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_off0000c3c6.bin
67047699b564be88bf9083d401b98206b6ac54f88181df7ad614507e234d8224		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C6 5588 bytes
font_01_sfnt_off0000d6b7.bin
3c06cf022714e559a22a982a236befd804bbffe52778b55d58e1a268262b8766		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B7 10764 bytes

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