Malicious PDF — malware analysis report

Static analysis result for SHA-256 28d0a89ff023725d…

MALICIOUS

PDF

46.1 KB Created: 2020-08-26 19:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bf9eb010c1ef59ca2cc319ab2689b66 SHA-1: 96e71e3fecb7ef0b658f7745d73a8e5ec30dca8b SHA-256: 28d0a89ff023725d29a6e5371ffd9126d12ff237d02e2c17bbb6ce71c69b51fa
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm with numerous external PDF links, many hosted on Shopify. This suggests a campaign focused on distributing content or manipulating search results. The ML classifier strongly supports the malicious nature of this PDF.

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=pedro+picapiedra+xxx
    • http://tavuz.danielealancarter.com/uploads/1/3/1/4/131483254/5111813.pdf
    • http://jixezal.jennybermas.com/uploads/1/3/1/3/131379578/394d76.pdf
    • http://lukogij.chestertonantiquemall.com/uploads/1/3/1/0/131070374/tisudalivudaz-burukiv.pdf
    • http://foropagi.ecoinclusive.org/uploads/1/3/2/7/132740720/6859924.pdf
    • http://files.gergelyszucs.com/uploads/1/3/0/7/130774979/327570.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/4425416730.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/42504681702.pdf
    • https://cdn.shopify.com/s/files/1/0461/9128/0277/files/wawisofaxalegiri.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/64989875230.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8428/files/2009_cadillac_escalade_performance_parts.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0987/files/deruritejolafurevisuwu.pdf
    • https://cdn.shopify.com/s/files/1/0450/3810/8830/files/performance_appraisal_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0437/8116/1121/files/bihar_tet_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/1710/7618/files/ragomowexasumejegozudug.pdf
    • https://cdn.shopify.com/s/files/1/0431/7190/5698/files/abramelin_ritual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3680/1184/files/filixizaxiwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5894/4405/files/wexafola.pdf
    • https://cdn.shopify.com/s/files/1/0431/8583/2096/files/bifiritipimubewumifake.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_off000068d9.bin
e3e2266fbc5e697454b225e2847d0862fd750f9529e995e4720027089d069190		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68D9 4928 bytes
font_01_sfnt_off000079a9.bin
11b9e939b84bb81b4b4b88524bf253c6e77c835e3fe8e34ac65886a4c4109391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A9 15948 bytes

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