Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9576ec2930e7a5a…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 12:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20e1a19c4b666bc2c416c7cbaf79d0f0 SHA-1: 65752ae9a839d2ab090d0c954f7eb6a994392820 SHA-256: c9576ec2930e7a5a062eb9c52314faa4eb754ba99050597c0ce3905f8fa4b38d
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.ru/pify?keyword=browband+size+guide'. This URL is presented within the document body, likely as a lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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.ru/pify?keyword=browband+size+guide
    • http://files.vbgprofessionals.com/uploads/1/3/1/4/131406202/cc28f292.pdf
    • http://files.pisdsr.com/uploads/1/3/1/4/131454305/momaradodugaza_ribovike.pdf
    • https://cdn.shopify.com/s/files/1/0454/6088/1560/files/mathematical_logic_12th_commerce.pdf
    • https://cdn.shopify.com/s/files/1/0434/8366/0441/files/how_does_botryoidal_hematite_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/9088/6312/files/jifiwosolenotavisapi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6781/0726/files/ncert_accountancy_book_class_12_part_2.pdf
    • https://cdn.shopify.com/s/files/1/0447/3035/1770/files/mesabenuzuxuzo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20136550696.pdf
    • https://cdn.shopify.com/s/files/1/0432/3039/6574/files/36951625439.pdf
    • https://cdn.shopify.com/s/files/1/0447/8458/2813/files/bsc_3rd_year_physical_chemistry_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1710/8642/files/fudiwakebek.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/c_o_format_in_letter.pdf
    • https://cdn.shopify.com/s/files/1/0429/5832/3865/files/182274560.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_off00005e61.bin
b8aa64e20340e9daeb25e475880eb06e8f1db32b3a4dda22ef4203a3eb5db266
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 5292 bytes
font_01_sfnt_off00007084.bin
4d11baea3211c6d2c43769c6f07923ed80b7fa17f1c8a75c9ad8d9ff6c7b2e64
pdf-font-stream PDF embedded font (sfnt) at offset 0x7084 14328 bytes