Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c715f8ffa311e11…

MALICIOUS

PDF

37.7 KB Created: 2020-08-27 22:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6bf9de0a4efb4aea904e80d8d2f813f SHA-1: 30dfce5231f09873c13f2ee1a3b6463eea628ebb SHA-256: 0c715f8ffa311e118870d951c1c126d54798b2646937b1172a716f607074a2e7
162 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as a download for Adobe Audition CC 2015, which redirects to a known malicious infrastructure. The PDF also hosts a large number of links, many pointing to benign Shopify URLs, likely as part of an SEO link farm to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=download+adobe+audition+cc+2015+full
    • http://wowifu.eriepetemergency.com/uploads/1/3/1/4/131409090/02995a118.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8131/0101/files/99004568841.pdf
    • https://cdn.shopify.com/s/files/1/0427/7701/8524/files/19267614373.pdf
    • https://cdn.shopify.com/s/files/1/0433/4669/0203/files/crocodile_tears_rs3_quest_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/7786/1527/files/25266447949.pdf
    • https://cdn.shopify.com/s/files/1/0435/7623/0051/files/bahishti_zewar_in_urdu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/4646/0840/files/89640504739.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/45706159243.pdf
    • https://cdn.shopify.com/s/files/1/0427/8085/2383/files/apa_6th_edition_citation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/kuvupud.pdf
    • https://cdn.shopify.com/s/files/1/0448/4608/8349/files/gsa_federal_credit_union.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kaxoku.pdf
    • https://cdn.shopify.com/s/files/1/0430/8788/8535/files/wilezuxazuredepimibategif.pdf
    • https://cdn.shopify.com/s/files/1/0430/5063/1319/files/kugudiluwekadasolilemuke.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_off00005580.bin
459bcfb92a9747c72ebda29a51da6ea6f5ed4427c0c5e5e9b87869b11e17d3f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5580 5420 bytes
font_01_sfnt_off00006829.bin
48750cc4bfc467cf0541b2d3461cc304eb48541cbaa1fca8bbe6af97f4cf4381		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6829 9980 bytes

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