Malicious PDF — malware analysis report

Static analysis result for SHA-256 8139324fda417c02…

MALICIOUS

PDF

42.4 KB Created: 2020-08-04 14:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3604a1275825433dc095636b20013b96 SHA-1: 15e59f60f3c1db7c6da66d1c061f064b040e4815 SHA-256: 8139324fda417c02dcdbabcbd264305dc188d4e87c4c9bcfe919169f6020daf6
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one identified as a known malicious redirector. The document body, though partially corrupted, also contains the URL https://ttraff.ru/pify?keyword=calentadores+solares+caseros+pdf, which is flagged as malicious. The presence of a large number of external PDF links, many hosted on Shopify, suggests an attempt to manipulate search engine results or distribute malicious content through a link farm. The ML classifier also strongly indicated maliciousness.

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=calentadores+solares+caseros+pdf
    • http://files.dianamdurand.com/uploads/1/3/2/8/132814977/xupubiwimoval.pdf
    • http://files.okgfdhotcpha.org/uploads/1/3/0/9/130969434/6f3b3c.pdf
    • http://files.apartmenttycoons.com/uploads/1/3/1/1/131163976/fukilidili.pdf
    • http://files.restored2yoursoul.com/uploads/1/3/0/7/130775649/bewumokusanazof_bikube_vidofiku.pdf
    • http://files.ongoldenpondguesthouse.com/uploads/1/3/0/7/130775734/taxumupojuresig-suvefodonefe-begupaxobagupux.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/dezujudunobebodosojaxagu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6231/3631/files/sasizusijazufajofomazot.pdf
    • https://cdn.shopify.com/s/files/1/0434/0393/5900/files/meretuxifulafelodale.pdf
    • https://cdn.shopify.com/s/files/1/0435/9254/8511/files/tamose.pdf
    • https://cdn.shopify.com/s/files/1/0434/4722/2422/files/zuduvonat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/19078689650.pdf
    • https://cdn.shopify.com/s/files/1/0437/6032/0663/files/67911836886.pdf
    • https://cdn.shopify.com/s/files/1/0435/4742/6965/files/naledibomuposaridor.pdf
    • https://cdn.shopify.com/s/files/1/0429/0510/8636/files/puwame.pdf
    • https://cdn.shopify.com/s/files/1/0433/9918/4551/files/mapedamudoruk.pdf
    • https://cdn.shopify.com/s/files/1/0427/5326/1724/files/54949963243.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_off0000666b.bin
e66430a82b00448c0b0489ca55a39b600089b7c34995cbd3f104ce2592470aa9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666B 5052 bytes
font_01_sfnt_off000077a2.bin
0e16574ff05070654c7c19dd4211e26085974bdbaa1bbdd968f58adf68ea26b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77A2 11352 bytes

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