Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c2bf5c2dedcba15…

MALICIOUS

PDF

47.6 KB Created: 2020-08-21 19:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77047cdb697c45d6eed09ead5246c9d7 SHA-1: 2c85deeb063e72e2f0680873ac33c3d3d22e590e SHA-256: 5c2bf5c2dedcba154cc92296562d19181dd0a22e64a06b83c6d7645209b20821
162 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link identified as a malicious redirector. The document body, though obfuscated, contains text suggesting a lure related to 'budgeting basics pdf' and includes the malicious URL. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links points to SEO manipulation for malicious purposes.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=budgeting+basics+pdf
    • http://xunevifup.decoratingwithgrace.com/uploads/1/3/1/0/131070858/9edade8cf.pdf
    • http://radiwus.ndtyacht.com/uploads/1/3/1/6/131606539/a50272b131944.pdf
    • http://files.alpenviro.com/uploads/1/3/2/8/132815791/7138cd5423f1e60.pdf
    • http://files.anchorcounselingservices.com/uploads/1/3/2/6/132682134/c2506ce6423f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6805/4940/files/42753189816.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37357510366.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/xewabuwoduzunefub.pdf
    • https://cdn.shopify.com/s/files/1/0432/8177/6795/files/13060706441.pdf
    • https://cdn.shopify.com/s/files/1/0427/6686/0455/files/statistical_inference_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/8863/4266/files/soraralosukejejizuzes.pdf
    • https://cdn.shopify.com/s/files/1/0431/9143/5422/files/49166936382.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/setixinojed.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/who_causality_assessment_scale.pdf
    • https://cdn.shopify.com/s/files/1/0432/6778/4864/files/vatavigesavupudunago.pdf
    • https://cdn.shopify.com/s/files/1/0437/9744/6816/files/sawavosorupofadesolovagum.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/69666591923.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_off00007af3.bin
18f66632fe2073619d3d206bc7c662ecae9d19314c4989b5764f8263396fd758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 5384 bytes
font_01_sfnt_off00008d55.bin
0f0e73594e712cf6532a1ae7fd1e897f7fd5e966ca39f86517bab4767f8b3fd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 10524 bytes

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