Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f33e542a98cca23…

MALICIOUS

PDF

39.0 KB Created: 2020-08-28 10:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1851cdfaccd21210eaf053d6f68f3a65 SHA-1: 68d42f014486cccb0ce2c264605b62ac4b3b954a SHA-256: 7f33e542a98cca235299c6711a43db02fc70bac3f3f90be9c8b9bea8a3323b50
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

This PDF file contains multiple embedded URLs, with a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though partially garbled, contains text related to 'Acessório para auscultadores de tele' and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious.

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=acess%25C3%25B3rio+para+auscultadores+de+tele
    • http://files.stonehousegallery.com/uploads/1/3/1/1/131163683/baxazo.pdf
    • http://files.vivi-design-studio.com/uploads/1/3/1/4/131406114/nikuk-monedonogama.pdf
    • http://files.coca-pills-drugs.com/uploads/1/3/1/4/131453577/4af94600.pdf
    • http://files.paulgoldberg.com/uploads/1/3/1/4/131437932/6622339.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0813/files/.pdf
    • https://cdn.shopify.com/s/files/1/0438/4066/7810/files/zavon.pdf
    • https://cdn.shopify.com/s/files/1/0432/7089/7824/files/40736291939.pdf
    • https://cdn.shopify.com/s/files/1/0430/9703/0817/files/quality_crops_bundle.pdf
    • https://cdn.shopify.com/s/files/1/0432/3698/2943/files/59742546467.pdf
    • https://cdn.shopify.com/s/files/1/0429/8113/0394/files/reading_capital_althusser.pdf
    • https://cdn.shopify.com/s/files/1/0437/7097/0263/files/72593891618.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/zawufada.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/quaternary_industry.pdf
    • https://cdn.shopify.com/s/files/1/0432/8049/8841/files/bojomolaj.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_off00005495.bin
03f282709d6bbd4c4bb0414feb0e64eb26b7029607a51d850967121dc834deb8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5495 5192 bytes
font_01_sfnt_off00006600.bin
dfe42cae81e4b0b0364bf41ec20d8a5191775ddca980aec5a05df0d2e1c4d066
pdf-font-stream PDF embedded font (sfnt) at offset 0x6600 12608 bytes