Malicious PDF — malware analysis report

Static analysis result for SHA-256 32da49214851bd07…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 01:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb0447675ed3182672752598b4e26d3b SHA-1: 5cdb991ccdcc11ca657996eca5091aa451ac7ac9 SHA-256: 32da49214851bd07ae92887805b6bdb7e72e32ca38096cf61d8d3c9cf4fc988a
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. The document body, though partially corrupted, suggests a lure related to an 'employer character reference letter template'. The primary malicious URL identified is https://ttraff.com/pify?keyword=employer+character+reference+letter+template, which is likely used to redirect the user to a further malicious destination. The presence of many links to external PDFs, some hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious 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=employer+character+reference+letter+template
    • http://files.renaissancesingersretreat.org/uploads/1/3/0/9/130969999/9275181.pdf
    • http://files.ersolutions.ie/uploads/1/3/2/6/132682585/nomubavalane_degudok.pdf
    • http://wonepevom.kikixoxo.com/uploads/1/3/2/6/132681862/5f5c64.pdf
    • http://files.kristinlukanec.com/uploads/1/3/0/7/130738644/9b85b575ad7e98.pdf
    • https://cdn.shopify.com/s/files/1/0432/6768/6556/files/gozobixasemuki.pdf
    • https://cdn.shopify.com/s/files/1/0449/8269/8142/files/emac_graphics_card.pdf
    • https://cdn.shopify.com/s/files/1/0434/3595/0236/files/nezofajavagi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9563/6633/files/4760282292.pdf
    • https://cdn.shopify.com/s/files/1/0439/0787/4984/files/66316833109.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/89835494909.pdf
    • https://cdn.shopify.com/s/files/1/0428/3976/9254/files/tears_for_fears_discography.pdf
    • https://cdn.shopify.com/s/files/1/0433/8905/9228/files/50529903758.pdf
    • https://cdn.shopify.com/s/files/1/0430/4424/1557/files/angel_eyes_abba_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/social_psychology_aronson_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/9657/0024/files/49913787518.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/pre_algebra_bittinger.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_off00005ef6.bin
2afce8f65b79a47e323f983548948b40dce424df2c598971b558f4e5a69c4d56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF6 5136 bytes
font_01_sfnt_off00007053.bin
7ad8074127b448684812cab8a7fc7f82d932dfc24f035851f17feaadf6345b25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7053 9376 bytes

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