Malicious PDF — malware analysis report

Static analysis result for SHA-256 e108407c7b02239f…

MALICIOUS

PDF

62.4 KB Created: 2020-09-21 06:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cddadf69cd2be173bffe39214ae292c4 SHA-1: e7d59c93868a7c0c666035524156b6628cbd1055 SHA-256: e108407c7b02239f6f2637a0f9f7e10af44e8ea7ba29d6372c357cdbc7f85075
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a high ML score and the presence of numerous embedded links. Several of these links lead to PDF files hosted on various domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting an attempt to lure users to malicious content. No scripts were extracted, and the document body contained mostly garbled text and metadata.

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.club/wix?keyword=what+does+covet+your+neighbor+mean
    • http://files.creatingrounds.com/uploads/1/3/0/7/130776276/jowemu.pdf
    • http://files.jehphotography.net/uploads/1/3/2/8/132814906/8024579.pdf
    • http://mufodes.westfordfire.com/uploads/1/3/1/8/131871816/relivido-betodi-kudotegaxoti-jogig.pdf
    • http://files.cobusinessadvisors.com/uploads/1/3/1/0/131070115/e9ea4914fa6d.pdf
    • http://files.bearpawsbernedoodles.com/uploads/1/3/1/4/131408099/38504d9e69638.pdf
    • https://cdn.shopify.com/s/files/1/0432/9766/9278/files/chicken_life_cycle_worksheet_preschool.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/kdigo_anemia_guidelines_2017.pdf
    • https://cdn.shopify.com/s/files/1/0437/6684/1505/files/andhra_jyothi_telugu_news_paper_anantapur_district_edition_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/2503/8497/files/64023133417.pdf
    • https://cdn.shopify.com/s/files/1/0438/5318/5174/files/dafilojibeduxom.pdf
    • https://cdn.shopify.com/s/files/1/0431/6574/5314/files/88_chevy_truck.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4416/files/68743732916.pdf
    • https://cdn.shopify.com/s/files/1/0430/1576/6177/files/61548283391.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/fupinegev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/sinifaxotuwozebubebukukit.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_off0000b665.bin
42eb1c684cb76c8cf22728e18adf33e7b9ed0c5dbfa6dc0c990528a191a28979
pdf-font-stream PDF embedded font (sfnt) at offset 0xB665 5636 bytes
font_01_sfnt_off0000c97a.bin
745b7f2eddd262dbf8b53772f57eb19ae5809b79ec2d9f44fededc81cf126553
pdf-font-stream PDF embedded font (sfnt) at offset 0xC97A 10376 bytes