Malicious PDF — malware analysis report

Static analysis result for SHA-256 51af7fe68f6d6392…

MALICIOUS

PDF

43.2 KB Created: 2020-08-15 17:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11de97d10829a37516aebffcbbac1c82 SHA-1: cd8aa53befaf9cbbdfb5d8e53998daf5aefe7852 SHA-256: 51af7fe68f6d6392a67e0a75ad146eb95dfbf1e707beb9cac7d02bad3ab003a6
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector heuristic. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially leading to further malicious content or phishing 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://ttraff.ru/wb?keyword=surface%20and%20subsurface%20investigation%20of%20groundwater%20pdf
    • http://fajolowi.tedxyouthbis.com/uploads/1/3/0/7/130739980/5554429.pdf
    • http://jokube.brasserielouloudi.com/uploads/1/3/1/6/131636668/4871032.pdf
    • http://kesalumow.turtlerecording.com/uploads/1/3/1/6/131606490/xesugeweb.pdf
    • http://files.wrighthandsmgmt.com/uploads/1/3/1/4/131437276/vixaduserudet_jusujajojavi_jiponos_jaxumotubimal.pdf
    • http://tamaron.slosymposium.org/uploads/1/3/1/0/131070374/753811.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/5896412077.pdf
    • https://cdn.shopify.com/s/files/1/0433/7840/9622/files/kimurekolamimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7328/9888/files/xogididotipisomawisovi.pdf
    • https://cdn.shopify.com/s/files/1/0434/4948/3420/files/pianoteq_5_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0432/6352/5029/files/62366790389.pdf
    • https://cdn.shopify.com/s/files/1/0437/5012/9813/files/votanejelinot.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/xixanokobowujekafiv.pdf
    • https://cdn.shopify.com/s/files/1/0428/7443/7791/files/whirlpool_cabrio_washer_manual.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_off00006b67.bin
6da90c50fa52badeb77909eac1f6f4db8487f73d3cb2899d6e842ba1ebe9dad5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B67 5684 bytes
font_01_sfnt_off00007ee0.bin
f0d017192749f05f511ceed0ebb87aee459ba02c1524a51cb197dbf1efd96feb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE0 9704 bytes