Malicious PDF — malware analysis report

Static analysis result for SHA-256 392490dc4bce3a29…

MALICIOUS

PDF

36.4 KB Created: 2020-08-25 19:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd5555f7d707efa56d0ce62288d8f6d7 SHA-1: af6affdb537d72a9bdaaa7f937c60341f916cd8c SHA-256: 392490dc4bce3a29f88a0c4a02ae7c29ce6218cc992d0b187495405b27da1469
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms this, indicating the document's primary purpose is to redirect users to a potentially harmful site. The 'PDF_SEO_LINK_FARM' heuristic suggests a tactic to artificially inflate search engine rankings or distribute links widely. No scripts were extracted, but the presence of malicious redirector links is sufficient evidence for a phishing or malware distribution attack pattern.

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/pify?keyword=ejercicios+de+planos+cartesianos
    • http://gizus.cadenceequestrian.com/uploads/1/3/1/4/131407552/jalof_nelajuviful_fogumenujimifog.pdf
    • http://files.bujinkanmedicinehat.com/uploads/1/3/2/6/132696351/56b89e7.pdf
    • https://cdn.shopify.com/s/files/1/0438/3594/9218/files/rusitowe.pdf
    • https://cdn.shopify.com/s/files/1/0432/4868/1120/files/82530547991.pdf
    • https://cdn.shopify.com/s/files/1/0433/8185/0268/files/45206757895.pdf
    • https://cdn.shopify.com/s/files/1/0427/7790/3263/files/8958120080.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/mov_to_mp3_converter.pdf
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/66140887182.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/17688994178.pdf
    • https://cdn.shopify.com/s/files/1/0433/6405/7238/files/fur_alina_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0437/2273/5765/files/vuxopipaditekebogi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5619/3955/files/23163349701.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/english_phonetics_and_phonology_exercises.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_off00004e08.bin
a407a0f36e05a8a81353d48a101c4f317661bb61e5a048643ccf2d612ea7acaa
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E08 5100 bytes
font_01_sfnt_off00005f69.bin
a672d9922b5607712161fed53cee8e3bae489a6851c90e949990409c73ac30eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F69 10992 bytes