Malicious PDF — malware analysis report

Static analysis result for SHA-256 d958e153c48cd639…

MALICIOUS

PDF

40.7 KB Created: 2020-08-19 19:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6fad8865a64e3cbbea4738b2f3bcb1d SHA-1: 6ce513afdc3977ee0863d868ac38e92fbd53d91a SHA-256: d958e153c48cd639cabc15bfc0c95dc918b798110907b633796c518f041eaec4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.cc'. This URL is presented within the document body, disguised as a link to academic resources. Additionally, the PDF exhibits characteristics of a link farm, containing numerous external links, many of which point to Shopify domains. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=journal+citation+reports+via+web+of+science
    • http://files.ednacrosstimbers.com/uploads/1/3/1/4/131454482/1947190.pdf
    • http://files.colemancomics.com/uploads/1/3/0/8/130873908/486405f12560ca.pdf
    • http://files.simpleeating.net/uploads/1/3/2/3/132303238/koxurusotuzusa.pdf
    • http://files.ajaxaspenproperties.com/uploads/1/3/0/7/130740378/1510251.pdf
    • http://files.bloomwildrose.ca/uploads/1/3/1/3/131383434/6242549.pdf
    • https://cdn.shopify.com/s/files/1/0435/2186/7930/files/grammar_games_for_adults.pdf
    • https://cdn.shopify.com/s/files/1/0430/8919/9268/files/muveleb.pdf
    • https://cdn.shopify.com/s/files/1/0431/3687/6695/files/30198088014.pdf
    • https://cdn.shopify.com/s/files/1/0435/8825/5912/files/statistical_database_security.pdf
    • https://cdn.shopify.com/s/files/1/0429/2483/4982/files/canons_of_rhetoric.pdf
    • https://cdn.shopify.com/s/files/1/0437/2037/6474/files/busovedekixejeza.pdf
    • https://cdn.shopify.com/s/files/1/0434/0452/5720/files/89358174165.pdf
    • https://cdn.shopify.com/s/files/1/0428/6686/8383/files/bones_forming_anterior_cranial_fossa.pdf
    • https://cdn.shopify.com/s/files/1/0446/6769/9353/files/64170618182.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xizijifopaxefiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8694/6206/files/xulurosivitujiwomasoxipa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zekimopesafirizaxos.pdf
    • https://cdn.shopify.com/s/files/1/0448/3465/2321/files/divodiwuvog.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_off000060c6.bin
74cbe1d056600e15db725cc84f35834f8429d810f40a2afab4ae3c0f87be5979		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C6 5292 bytes
font_01_sfnt_off000072e1.bin
daa5e9bbad4302f8bd1ee28ca319098b98a135a970d27e2ad45910930a1b440b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E1 10180 bytes

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