Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b434f7ded98b675…

MALICIOUS

PDF

57.2 KB Created: 2020-08-31 22:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28484ec5eb5007246fbe00dc14d08ceb SHA-1: 31b57bfc1477e423a0d415240249e82380cd7724 SHA-256: 2b434f7ded98b67534009aa53d1e37f79c606dda99a60c3093e82a0cd0b23f51
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/wix?keyword=free+employee+attendance+tracker+excel+template'. This URL is presented within the document body as a lure for a free employee attendance tracker template. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/wix?keyword=free+employee+attendance+tracker+excel+template
    • https://static.usrfiles.com/ugd/eed56f_faec936be97d4ebe94f8c7808fb16671.pdf
    • https://static.usrfiles.com/ugd/b8c837_f190770c6c074c80a9063f0f03d98476.pdf
    • https://static.usrfiles.com/ugd/b8c837_87d00bb687ca4e67b4ae52a38c2d35ef.pdf
    • https://cdn.shopify.com/s/files/1/0430/4224/2709/files/fuerzas_intermoleculares_puente_de_hidrgeno.pdf
    • https://cdn.shopify.com/s/files/1/0457/3698/4742/files/jingle_bells_song_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/2891/4087/files/vetugunemizasurefibamaxa.pdf
    • https://cdn.shopify.com/s/files/1/0445/4304/9892/files/64914803374.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/35309731028.pdf
    • https://cdn.shopify.com/s/files/1/0430/6678/5949/files/22358972168.pdf
    • https://cdn.shopify.com/s/files/1/0434/0563/9836/files/75967270977.pdf
    • https://cdn.shopify.com/s/files/1/0449/7352/3112/files/annual_general_meeting.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008522.bin
9a81052b4e7dea4aa4c450557ef00a4fd1fd5ba1f04009247d371e96dfb2b904
pdf-font-stream PDF embedded font (sfnt) at offset 0x8522 5232 bytes
font_01_sfnt_off000096dc.bin
1ca19e58de121a7afe266b3a1fd7625653a603008b535b21c8d9c7e0093fc485
pdf-font-stream PDF embedded font (sfnt) at offset 0x96DC 1596 bytes
font_02_sfnt_off00009efe.bin
1be812b1e183440b21100bd019f024b6d02523b74749f42b6941afc7b37623d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EFE 10128 bytes
font_03_sfnt_off0000c19c.bin
2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174
pdf-font-stream PDF embedded font (sfnt) at offset 0xC19C 16144 bytes