Malicious PDF — malware analysis report

Static analysis result for SHA-256 73db418bb310b064…

MALICIOUS

PDF

53.5 KB Created: 2020-09-01 11:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 883f81e880ae7958ad1af94d84ceca1b SHA-1: 6fddf8dbd9587004be47ad81d996093c839a6010 SHA-256: 73db418bb310b064c0b25cb23ef2adbb90eafa266bc1839b0f5be26b830acd08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to 'Bamboohr performance appraisal' and embeds numerous links, including one to a known malicious redirector at https://ttraff.ru/wix. The presence of a link farm and the ML classifier's high confidence score indicate a malicious intent to redirect the user to harmful content. No scripts were extracted, but the document structure and embedded links strongly suggest a phishing or redirection attack.

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.ru/wix?keyword=bamboohr+performance+appraisal
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0750/0711/files/71820460454.pdf
    • https://cdn.shopify.com/s/files/1/0430/2848/0163/files/gedikijodet.pdf
    • https://cdn.shopify.com/s/files/1/0432/3888/3485/files/74542598456.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/new_emotional_status.pdf
    • https://static.usrfiles.com/ugd/9d869b_b4da50d0d5d945a09f079a49a643d3e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_529951ec6117469db58261daf5e5997e.pdf
    • https://static.usrfiles.com/ugd/10b11f_6a72cbfe8c9948bca6cdb8897e5c6ef8.pdf
    • https://static.usrfiles.com/ugd/f8de3e_379a70b07b744264b35daaf2197ec499.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/52443618003.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/87858900974.pdf
    • https://cdn.shopify.com/s/files/1/0438/0108/4064/files/91818978369.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/duwugirejovunavomubo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/97751944629.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/budapest_tour_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/blumenfeld_gambit.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/sepuzixekiweke.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/possessive_form_of_family.pdf
    • https://cdn.shopify.com/s/files/1/0431/0456/7450/files/noxonilasisozabopexavom.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000093a0.bin
c87d63eab14f623a25504cf61949c40b7ccefb07097eeb2d731107dae7f416b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93A0 5444 bytes
font_01_sfnt_off0000a5f7.bin
5c6c245b16ccf7630e253a293233956eb4e68f24bfdf909a59c6438d9d399920		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5F7 10272 bytes

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