Malicious PDF — malware analysis report

Static analysis result for SHA-256 743d606c90319ceb…

MALICIOUS

PDF

32.4 KB Created: 2020-08-21 08:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b1c2618265603e8818267a707b2305b SHA-1: dba9db8fa3cfdb3501539e2985e6debd1186a937 SHA-256: 743d606c90319ceb9dcfabb39e9fec612a4b66c7c006baeb4a86ff337a0001fe
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The document also features a large number of external PDF links, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly indicated maliciousness, supporting the presence of these suspicious elements.

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=bal+hanuman+pics
    • http://files.brushandbranch.co/uploads/1/3/0/7/130740344/2297158.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/7832/8221/files/rejawe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6815/3253/files/dibukusotonajudujab.pdf
    • https://cdn.shopify.com/s/files/1/0457/0382/3516/files/awd_manual_transmission_cars_2018.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/3742027618.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5562/files/dubiro.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7796/files/mifuvuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1614/3526/files/emulation_vs_simulation.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/woziki.pdf
    • https://cdn.shopify.com/s/files/1/0431/3936/7061/files/ruluzoduzawekefol.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/35765088829.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_off00004377.bin
c466216cac32ebe14ba76fdc2af33b85b2ddffb791cc34df7049542f75eca089		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4377 5124 bytes
font_01_sfnt_off000054b3.bin
21bb68c89ab7c7e8f86462e50c60d7e1aae073c9640a8602298f37634b5d34e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B3 9600 bytes

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