Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba7d325cb7bf921…

MALICIOUS

PDF

35.9 KB Created: 2020-08-12 12:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1b6a2fa9e3174097903076ef642f1db SHA-1: 546c134771615fb8a617b28c1ba4fccd36b59fb6 SHA-256: 5ba7d325cb7bf921193033074e03bb363a4339c8aea847c9e95898bf204d8a77
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 pointing to external resources, and one critical link identified as a malicious redirector. The document body, though partially corrupted, contains the text 'Graph given slope and y intercept worksheet' and the malicious URL, suggesting a lure to a phishing or malware distribution site. 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/wb?keyword=graph%20given%20slope%20and%20y%20intercept%20worksheet
    • http://biluwa.restaurantbeaumonde.com/uploads/1/3/0/7/130776394/faxarefimexolav.pdf
    • http://files.andrewjack.net/uploads/1/3/0/9/130969061/a573fd.pdf
    • http://files.rangecustomhomes.com/uploads/1/3/1/3/131381612/6606813.pdf
    • http://vaforate.drivinglessonsrichmond.com/uploads/1/3/0/8/130814769/9428472.pdf
    • http://files.leilaspaws.com/uploads/1/3/1/8/131856672/xuvesuguwobu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9281/1681/files/dugego.pdf
    • https://cdn.shopify.com/s/files/1/0427/5296/6812/files/new_hampshire_title_application.pdf
    • https://cdn.shopify.com/s/files/1/0446/9476/5724/files/book_review_structure.pdf
    • https://cdn.shopify.com/s/files/1/0428/1224/4134/files/29552229642.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9124/files/12905704919.pdf
    • https://cdn.shopify.com/s/files/1/0434/3057/6278/files/gojijajiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2779/9957/files/distance_between_two_addresses.pdf
    • https://cdn.shopify.com/s/files/1/0429/6497/5765/files/41474209318.pdf
    • https://cdn.shopify.com/s/files/1/0432/9983/1968/files/nofejawexiki.pdf
    • https://cdn.shopify.com/s/files/1/0433/0940/0214/files/10663101389.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_off00004eb4.bin
a5624a44e9dde94eb102a3759e8263e57ea90b12416fb2da3c7671ec71634339
pdf-font-stream PDF embedded font (sfnt) at offset 0x4EB4 5684 bytes
font_01_sfnt_off00006225.bin
3d9a917faaa162439a9fa5a584dd8ae7b411f75bb89615ccb225f3e62d276c2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6225 9576 bytes