Malicious PDF — malware analysis report

Static analysis result for SHA-256 642375ab33fba4ad…

MALICIOUS

PDF

39.5 KB Created: 2020-08-15 00:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a0b05c495853a505a82d4ad0843caf5 SHA-1: 03679acc6df176cab0555c0b044ddde6a1b44227 SHA-256: 642375ab33fba4ad2896ddd0faae50541260f65776f29d6da35420f467ea1307
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is designed to lead users to further malicious content. The document also functions as a link farm, containing numerous links to other PDFs, many of which are hosted on Shopify. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL suggests an attempt to distribute malware or conduct phishing.

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=measuring+up+reading+level+d+answer+key
    • http://fubarik.kahenyandkaler.com/uploads/1/3/1/3/131379246/aca1e2ff132cb.pdf
    • http://lubuvi.hellokaelo.com/uploads/1/3/0/7/130740257/lebisozedijaras.pdf
    • http://files.cheekyfoxtumblers.com/uploads/1/3/0/7/130739754/diligesigivij.pdf
    • http://dozedajo.avalonlinenrental.com/uploads/1/3/2/8/132814930/wofitavusiro-ladofubebexa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/partnership_agreement_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/1800/2340/files/turobajezatus.pdf
    • https://cdn.shopify.com/s/files/1/0437/1247/9382/files/nofator.pdf
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/bifojojaxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1466/5886/files/wobofasewo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/leduriz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3646/5559/files/bartleby_the_scrivener_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/cobra_dsp_9200_bt.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/lobogune.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/nizodatulukumewa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9994/5112/files/skyrim_dual_wield_mod.pdf
    • https://cdn.shopify.com/s/files/1/0439/2232/5672/files/data_structures_and_algorithms_by_balaguruswamy.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/xikadumakovu.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_off00005aea.bin
61174c2f13a2a7cfa011b33697d4645acb5d0a2fc4b292d83cdf670d8aa81b52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEA 5448 bytes
font_01_sfnt_off00006da5.bin
cc24842c116852f0acc41c98ec42579eb52add50665b8d9bcd7d9c2a9c517998		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DA5 10348 bytes

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