Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a42ce4c13622dc4…

MALICIOUS

PDF

65.0 KB Created: 2020-12-13 16:44:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0015f0e4eac107c023515f7ac3d44f6 SHA-1: 77d0a88d70367f306548e966ce89cc2cbd7be1bf SHA-256: 9a42ce4c13622dc406dca028b15b8bab85c03b466bf822d0c040ba73ef5870ef
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'earn to die 2012', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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?utm_term=earn+to+die+2012+unblocked+part+3
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/8ba9b2b6be45.pdf
    • https://wegupufula.weebly.com/uploads/1/3/0/8/130813429/vukepagifuvug.pdf
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/ee42df8d1e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/sivanira/zillow_homes_sold_recently.pdf
    • https://uploads.strikinglycdn.com/files/0fbd98d2-1fee-46bd-a626-e19f244141ff/wuzamuvonujasakajaveket.pdf
    • https://s3.amazonaws.com/sikuva/chromebook_keyboard_shortcuts.pdf
    • https://s3.amazonaws.com/kewakuko/34944225235.pdf
    • https://s3.amazonaws.com/dejazuvorira/wavexifotogedetelowerez.pdf
    • https://uploads.strikinglycdn.com/files/50a3bc15-3364-49b5-859c-60e8fd71e8c1/90770717122.pdf
    • https://s3.amazonaws.com/sabobenuwe/59051672372.pdf
    • https://uploads.strikinglycdn.com/files/ba407d2d-140d-4d7e-aa96-7e89b80f0a9d/50264589577.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6aa.bin
b90b109c34db9b2d961be312c0c64f13ba4f5af9c83d6ae4556a72cb7f468167
pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AA 2880 bytes
font_01_sfnt_off0000c0e8.bin
570338d27cbbfccecc8d6611ea23eaa891bf5a499da690736dad32e9f2918be8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E8 5540 bytes
font_02_sfnt_off0000d3d3.bin
a9312ff7c282249e498dcf0a5ebe787df32cfab3e47feabc89aa8528d4d5cc6d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D3 10376 bytes