Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a70276b36f8b61…

MALICIOUS

PDF

48.8 KB Created: 2020-07-29 07:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5d76209ea844aca96abb896fa4b6cd2 SHA-1: 70333e0f0f280048168f414c9d6472cebb220e8b SHA-256: d1a70276b36f8b613e6efc38bbe747f2dddcf7a8e0e6aa89ee47ed73b60cc08f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL, 'https://ttraff.ru/pify?keyword=frommers+guide+maui', is directly linked to known malicious infrastructure. The document body, though heavily obfuscated, contains text fragments suggesting it is masquerading as a guide, likely to entice users to click the 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.ru/pify?keyword=frommers+guide+maui
    • http://files.ashleydotson.com/uploads/1/3/1/8/131871970/1762772.pdf
    • http://files.chinayachtimports.com/uploads/1/3/0/8/130874254/b17c91255498.pdf
    • http://files.mindfulmoves.net/uploads/1/3/0/8/130874192/3607041.pdf
    • http://files.eleonorarohland.com/uploads/1/3/0/7/130776599/d8b32bf.pdf
    • http://files.islandschoolhistory.com/uploads/1/3/1/6/131637325/5742891.pdf
    • https://cdn.shopify.com/s/files/1/0436/3111/6448/files/mazakufenox.pdf
    • https://cdn.shopify.com/s/files/1/0429/2067/3433/files/pogujojatopogili.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/merasusew.pdf
    • https://cdn.shopify.com/s/files/1/0439/0292/7003/files/93291150383.pdf
    • https://cdn.shopify.com/s/files/1/0433/1575/7214/files/93199681568.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/tumadefujamolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7026/7300/files/86756619523.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rejukimuvili.pdf
    • https://cdn.shopify.com/s/files/1/0433/9305/6933/files/8305322435.pdf
    • https://cdn.shopify.com/s/files/1/0434/3549/1490/files/43208835778.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/53125061430.pdf
    • https://cdn.shopify.com/s/files/1/0431/2170/5124/files/26460420993.pdf
    • https://cdn.shopify.com/s/files/1/0430/8559/4775/files/todesasatiwupofe.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_off00007fc0.bin
c477f1ba008e831707d5b48da795f0c34443590c840d6c64ec3ee1ae9e3ee32c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FC0 4764 bytes
font_01_sfnt_off00008fe8.bin
ef05d86aabbc934c704da9f38e1c355dcacf4b1e86ebc946fd510cf1710ca85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FE8 10680 bytes

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