Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb2d93ddf03af06…

MALICIOUS

PDF

39.7 KB Created: 2020-08-13 21:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44adddeaea1c689194d4b7888f5129da SHA-1: eddcef07a51b2e8798029f10bc8255110a73c981 SHA-256: 0fb2d93ddf03af06993fb2b093dd3d71bc74ea098591498197d8e88fae9d2dec
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to a link farm hosted on Shopify, with one critical link identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The presence of embedded URLs and the heuristic firings suggest an attempt to direct users to malicious infrastructure, likely for phishing or malware distribution.

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=rcb+video+songs
    • http://files.reliableirrigationsystem.com/uploads/1/3/2/6/132695401/8868859.pdf
    • http://kafiwa.kendrarosemontagna.com/uploads/1/3/1/4/131436967/8874434.pdf
    • http://files.1as.ency-education.com/uploads/1/3/2/6/132696111/vipasidisutofevugej.pdf
    • http://files.danamcmillan.com/uploads/1/3/1/8/131872032/3223436.pdf
    • http://nokolopik.ryanleepr.com/uploads/1/3/0/8/130814328/kapatibubupijekir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/no_mans_sky_freighter.pdf
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/pabevogen.pdf
    • https://cdn.shopify.com/s/files/1/0430/8621/7383/files/mobuxujuwuzogeluvebuzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/mubivesamafejixanopida.pdf
    • https://cdn.shopify.com/s/files/1/0432/8869/0841/files/74340882.pdf
    • https://cdn.shopify.com/s/files/1/0438/1258/5634/files/acls_algorithm_cards.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/xeriwosarosupedakuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7391/files/vufugavi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/automation_engineer_resume.pdf
    • https://cdn.shopify.com/s/files/1/0429/7284/0090/files/zapasuxeviz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0812/2280/files/24979075073.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/93018965741.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_off00005be4.bin
6e936e7a0e5540487dddecacccc20c8635a0484c964073bb274601909f8a203f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE4 4976 bytes
font_01_sfnt_off00006cee.bin
091298ff37a13e01dc409c866246887b6c2bebd84d3a86c3bc9a94439c66fac7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEE 11032 bytes

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