Malicious PDF — malware analysis report

Static analysis result for SHA-256 d97e74333c73d6e1…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 04:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d36783224559f1e3eff589a6e37986dd SHA-1: 049ba490f9d0d967b90684c470a5c7619d36711c SHA-256: d97e74333c73d6e1a4519701030c4b30030bbbf1865fc56a3417fb47cbe00e03
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be part of a link farm strategy, likely to improve search engine rankings for malicious content or to distribute further malicious links.

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=degradation+of+purines+and+pyrimidines+pdf
    • http://poletuz.alexandradeglise.com/uploads/1/3/1/1/131164456/681490.pdf
    • http://bogisub.imagineadv-webbanners.com/uploads/1/3/0/9/130969162/ae5825f.pdf
    • https://cdn.shopify.com/s/files/1/0435/0027/3830/files/semomeviwofimixofapomu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/zitali.pdf
    • https://cdn.shopify.com/s/files/1/0428/1381/6995/files/zatomipawujup.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1716/files/fegaranawas.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0433/0412/4580/files/69570448889.pdf
    • https://cdn.shopify.com/s/files/1/0431/1462/7234/files/cfa_2020_curriculum_level_1.pdf
    • https://cdn.shopify.com/s/files/1/0432/0083/9842/files/vobupagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/98133656616.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_off00006909.bin
9df1d63d9a7675033c9f790710002d422250a642f8524a6448cb650a38464f8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6909 5428 bytes
font_01_sfnt_off00007b79.bin
d0d20631c848c4605a5ee048b2b68c7e961871f454539dbed8c70f18df35bec7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B79 10040 bytes

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