Malicious PDF — malware analysis report

Static analysis result for SHA-256 0988ab8667df6063…

MALICIOUS

PDF

43.6 KB Created: 2020-08-01 17:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0f5d492f98b594e0328203607c14ea6 SHA-1: 859f1d0ba165f5a70bbfec8983c6e4bd4e5b3dd4 SHA-256: 0988ab8667df6063ebf3123984a02fbdf049a958b7bf93f17ae7abc71a84299d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'guitar shop database exercises solutions' and a URL that appears to be part of a link farm designed to attract traffic. 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.com/pify?keyword=my+guitar+shop+database+exercises+solutions
    • http://files.oregoncma.org/uploads/1/3/2/8/132814972/ximukuzekoxumexedin.pdf
    • http://files.etotdelaware.net/uploads/1/3/1/8/131860787/89aa3.pdf
    • http://files.cavingintocuriosity.com/uploads/1/3/0/7/130775498/noxaj-kelokujirak-toduf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/64421369084.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2494/files/65346052780.pdf
    • https://cdn.shopify.com/s/files/1/0431/5863/4650/files/83461641763.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/zerimapesovebojo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8766/7103/files/42685137029.pdf
    • https://cdn.shopify.com/s/files/1/0430/1452/0995/files/pizavotisazasise.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/gafako.pdf
    • https://cdn.shopify.com/s/files/1/0431/0417/4233/files/povososazopojorujax.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8565/files/sebemavorupibabil.pdf
    • https://cdn.shopify.com/s/files/1/0430/1769/9477/files/63769376006.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/82905472121.pdf
    • https://cdn.shopify.com/s/files/1/0432/2462/9411/files/bekudonoxazoladide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5625/files/63307642151.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_off00006aa0.bin
26968a519227893fc401156917259b72b1b4c4d75c14a813e01dfe3eaed18515
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA0 5652 bytes
font_01_sfnt_off00007deb.bin
610aa46ffab18b42206224538b33af42acd233e8fad2d838c44e21feeffab4bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEB 10436 bytes