Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f6fab142daf4cc…

MALICIOUS

PDF

41.5 KB Created: 2020-08-04 17:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf3bc0df8994fd0cae1a67803f38405 SHA-1: f7035c723d5e31eaac842bce7af11bb14ab73a62 SHA-256: b3f6fab142daf4cc6485aded072e472eb5fabae051cc5f0f686ceb68ad3d368e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The primary redirector URL is https://ttraff.ru/pify?keyword=tp+link+archer+c1200+manual+pdf, which is designed to lure users into clicking through to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=tp+link+archer+c1200+manual+pdf
    • http://files.peequality.com/uploads/1/3/0/8/130874284/3905499.pdf
    • http://files.whenwealllivedintheforestandnoonelivedanywhereelse.com/uploads/1/3/0/7/130776262/vefosajizekolin-sujez-jidusako-wolutewamaxa.pdf
    • http://files.ioscaid.com/uploads/1/3/1/6/131606275/musoj_ragunuzafal_jetelusibubavaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/7451/8178/files/texurisumotigef.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/kadevamuxisali.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/30714196875.pdf
    • https://cdn.shopify.com/s/files/1/0432/7571/4715/files/lenny_face_middle_finger.pdf
    • https://cdn.shopify.com/s/files/1/0439/0617/1048/files/bamogibugakomulewime.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7313/files/lugizurigenuwisama.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1298/files/judepejevebifixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5706/1788/files/8430833969.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0432/7247/0686/files/86100071522.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/gilolotelasutepex.pdf
    • https://cdn.shopify.com/s/files/1/0432/0306/8068/files/virurizejafukiwigo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9752/2329/files/duxidalovo.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f99.bin
19e974cff2f9b2188f8034ff66309cbd79fc8ddec6b431bca23a2642d7c37b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F99 5556 bytes
font_01_sfnt_off00007258.bin
18b8da87a426ea7bf351b552e69dafeacdd310832d66563068d3e9af536d7cf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7258 12344 bytes

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