Malicious PDF — malware analysis report

Static analysis result for SHA-256 a616cb81c01b132c…

MALICIOUS

PDF

33.6 KB Created: 2020-08-29 16:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3466460cb344a39da506688df72e42a SHA-1: 5e8c8e09c11836e7b410077ab3a33748a9c80ad3 SHA-256: a616cb81c01b132c5cfeaa8f7f1c27746fc53d6002511995f163366e29b30a5e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with numerous embedded links to other PDF documents hosted on various platforms. The primary malicious link is `https://ttraff.ru/wix?keyword=acoustic+audio+aa5170+manual`, which is likely used to redirect the user to a malicious site. The document body contains garbled text, but the presence of the malicious URL is clear.

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=acoustic+audio+aa5170+manual
    • https://cdn.shopify.com/s/files/1/0431/6132/1621/files/ludatoxabokijepixigi.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/40633396195.pdf
    • https://cdn.shopify.com/s/files/1/0431/6987/4080/files/culvert_design_and_operation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6069/files/2247402129.pdf
    • https://static.usrfiles.com/ugd/b8c837_6733231724be44e0b5452b979acb5e2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ebaa75bf0de41ca8c478a6c151162ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_7799f5829d814ecabb6031fa39c561ff.pdf
    • https://static.usrfiles.com/ugd/b8c837_7defd885b47d499c902e3ab214b45bd3.pdf
    • https://cdn.shopify.com/s/files/1/0433/9302/4158/files/aakash_notes_of_biology_class_11.pdf
    • https://cdn.shopify.com/s/files/1/0461/6916/1880/files/kerrigan_co_op_commander_guide.pdf
    • https://cdn.shopify.com/s/files/1/0457/3416/6694/files/aggregator_model_in_e-_commerce.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/jobafomuto.pdf
    • https://cdn.shopify.com/s/files/1/0433/8365/2506/files/astm_standards_book.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_off000045c3.bin
b2623064eda2f49585f6230324d3346104e647b7bff338af23a98895e9b9311f
pdf-font-stream PDF embedded font (sfnt) at offset 0x45C3 5376 bytes
font_01_sfnt_off00005803.bin
1778ccfb995e8fd74e7ec9d63aa9d038b6fdc8bc16ab83390e8f503de15dbebd
pdf-font-stream PDF embedded font (sfnt) at offset 0x5803 9828 bytes