Malicious PDF — malware analysis report

Static analysis result for SHA-256 274f84363f3e3aaa…

MALICIOUS

PDF

41.0 KB Created: 2020-08-26 16:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 168d219ca94e46a4ad61f74e515d3ec7 SHA-1: 429556c63361de81752176ef2eeaf1742404337f SHA-256: 274f84363f3e3aaaf455e927153c4bc619f8978f1690243e41714677bb18ecd4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=polaroid+z340+manual'. This URL is embedded within the document body, suggesting a social engineering lure to trick users into clicking the link. The presence of numerous other links to Shopify-hosted PDFs, while many are benign, indicates a potential link farm strategy. 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=polaroid+z340+manual
    • http://files.muttleys.ca/uploads/1/3/1/6/131636914/zedometagum.pdf
    • http://files.canisteowesleyanchurch.com/uploads/1/3/1/4/131453633/0d43fa.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/drrr_grade_11.pdf
    • https://cdn.shopify.com/s/files/1/0459/8982/2631/files/shankar_mahadevan_telugu_songs.pdf
    • https://cdn.shopify.com/s/files/1/0438/4486/2114/files/applied_subsurface_geological_mapping_with_structural_methods.pdf
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/99886761485.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8935/files/nalufigo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/gezesebekudex.pdf
    • https://cdn.shopify.com/s/files/1/0454/6861/4808/files/nergies_renouvelables_avantages_et_inconvnients.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/bikenanavevadalitejito.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/30042545922.pdf
    • https://cdn.shopify.com/s/files/1/0431/4441/3341/files/nulibobitifafuvopekak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/95464944843.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/82685357732.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/sikowufowamumumejewujiri.pdf
    • https://cdn.shopify.com/s/files/1/0429/0910/6332/files/49186060295.pdf
    • https://cdn.shopify.com/s/files/1/0434/6226/2936/files/41438395350.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_off000060c6.bin
dadd0f6ad5b658a688d4c0c86f07fcadd09a43701d261921934299c1c556fb50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 5236 bytes
font_01_sfnt_off00007287.bin
ff66111e40b3492e2d07e7fdd83bd6b06b05dba4841ebc5dcfdc29bc6a84caf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7287 10444 bytes

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