Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b09f26b152f1d7c…

MALICIOUS

PDF

46.3 KB Created: 2020-08-03 12:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1318715221c8b2e04cbdb00607fcfb53 SHA-1: bf18158fb5a5c262a9c3d97e0589634b42701b85 SHA-256: 9b09f26b152f1d7c3e92b306494e09d64264f5b537c343cc2741927dbe45554c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO poisoning and redirecting users to malicious sites. One prominent link directs to 'ttraff.ru', a known malicious redirector, disguised as a vehicle maintenance manual. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm and redirector strongly suggest a phishing or malware distribution attempt.

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=2015%20nissan%20pathfinder%20maintenance%20manual
    • http://files.anniepercussion.com/uploads/1/3/2/7/132740321/disatibe.pdf
    • http://files.clevelandpianoteachers.org/uploads/1/3/0/7/130775145/b222848.pdf
    • http://damexoj.cateandila.com/uploads/1/3/0/9/130969465/4756702.pdf
    • http://files.victoriaghairdesign.com/uploads/1/3/1/4/131483110/somapul_fotaboko_bigevox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/rafiwuvigunopimojida.pdf
    • https://cdn.shopify.com/s/files/1/0437/7418/1534/files/sissy_training_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/1068/6113/files/vatibewumowelebumewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/89818252018.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/36348185965.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pejolezogumulugadajo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3365/7498/files/venereji.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8054/files/bibijikifavutajevij.pdf
    • https://cdn.shopify.com/s/files/1/0431/0794/2549/files/95546730412.pdf
    • https://cdn.shopify.com/s/files/1/0437/5235/8049/files/ulaby_fundamentals_of_applied_electromagnetics.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/70257783714.pdf
    • https://cdn.shopify.com/s/files/1/0433/5150/7112/files/votivakijozavozezaseniwog.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/72961244612.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_off000072ca.bin
0af8485d18305ecab7ec132495652db8dba3f894b01d8cbca377a589d9005d86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CA 5748 bytes
font_01_sfnt_off0000863d.bin
1d6b72eb36efd6ab0a28dd3854a3c84cdd3d893510498694733c9f4644ac0b26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x863D 11024 bytes

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