Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa7cb361d38cafc…

MALICIOUS

PDF

44.5 KB Created: 2020-10-31 22:53:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27ab9ccd1b197bb89180cec68cbe1711 SHA-1: d16f15b08170bfff6e301fa9c43c0610c251f8dc SHA-256: afa7cb361d38cafc8c67cf9e6e339682bd5f2eeb54e1bd90a47f63a7c52642ec
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with the primary URL identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with link farming or SEO spam tactics, aiming to drive traffic to potentially malicious sites.

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://gettraff.ru/123?keyword=when+to+harvest+carrots+and+beets
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5f98a6034993f.pdf
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5f9383de5d692.pdf
    • https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/pizemawozabiwi.pdf
    • https://cdn-cms.f-static.net/uploads/4420752/normal_5f9762501e5d3.pdf
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5f945e8457ec0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/miosha_powered_industrial_truck_test_answers.pdf
    • https://cdn.shopify.com/s/files/1/0494/4884/5471/files/vukinofikafefa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2076/2783/files/70641152932.pdf
    • https://cdn.shopify.com/s/files/1/0485/2609/8594/files/52159515870.pdf
    • https://uploads.strikinglycdn.com/files/cb75c719-5da4-46a7-b28e-453ecb3c7b02/83224807738.pdf
    • https://cdn.shopify.com/s/files/1/0500/1032/5150/files/estimating_fractions_practice_worksheets.pdf
    • https://uploads.strikinglycdn.com/files/de103406-419f-4b40-ba14-3d414a61ea2e/38353382670.pdf
    • https://uploads.strikinglycdn.com/files/b9b9307a-3dcc-4707-913e-76a64cd68da8/53328148422.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/guruje.pdf
    • https://uploads.strikinglycdn.com/files/b8e209b6-c1ad-4b03-9b43-70b9ef1996c5/difavukudizevosamumirav.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_off00007072.bin
3f6e2181137e0f0eee2f9c4edc197eb165c0255feaa3b8e45f817c5175f589e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7072 5208 bytes
font_01_sfnt_off00008234.bin
49d2e4ec9e38e8b29a9ccafabc4af949269d8e34ad37b6952aee92c20e26cad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8234 10008 bytes