Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ceabc8293a17834…

MALICIOUS

PDF

46.0 KB Created: 2020-08-11 17:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c849c78fdb2828bf7cdc07d4e7f63637 SHA-1: fa8a825e5b4d44ba4e9e2489bbd3bd97ed781088 SHA-256: 3ceabc8293a178342c654aaab12495bd75014300c2c746bde7578a1d3b9b6c73
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document exhibits characteristics of a link farm, embedding a large number of external links, with the primary redirector URL being identified as malicious. The ML classifier strongly supports the malicious verdict. While no scripts were extracted, the sheer volume of links and the identified malicious redirector suggest an attempt to lure users to harmful content, likely for phishing or malware distribution.

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=ca+dmv+262+form+pdf
    • http://files.gtdphil.org/uploads/1/3/0/9/130969438/4623576.pdf
    • http://jitatukaw.johnnyomusic.net/uploads/1/3/2/8/132814989/votigorijifipaf.pdf
    • http://files.melysionmeigancakes.com/uploads/1/3/1/6/131636834/xekivuf-karinabevi-jugedatodit.pdf
    • http://files.cebutoursandtravel.com/uploads/1/3/1/0/131070786/735418.pdf
    • http://files.cherryridgebaptist.com/uploads/1/3/2/7/132740515/raxaxoxajakanoxuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/pufarozex.pdf
    • https://cdn.shopify.com/s/files/1/0430/2772/6489/files/botany_neet_questions.pdf
    • https://cdn.shopify.com/s/files/1/0437/1025/1176/files/nojupoxu.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9273/files/biblia_nuevo_testamento_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/rabigidoguka.pdf
    • https://cdn.shopify.com/s/files/1/0429/1140/0102/files/sazesufewokitanodajawabuk.pdf
    • https://cdn.shopify.com/s/files/1/0435/4097/1674/files/54092902905.pdf
    • https://cdn.shopify.com/s/files/1/0434/4512/5281/files/17452548736.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/276339546.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0821/files/managing_the_cycle_of_acting_out_behavior_in_the_classroom.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9588/files/likeluloxamowunuji.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_off000076b1.bin
1fabf1be997ccaece2714912c595746c717531545918f4f3e3ec2e41482433fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76B1 5228 bytes
font_01_sfnt_off0000886f.bin
df0d690df21b9f8e62e85dd6ba95a34167ec5f781744d9d0f7bfa4008f8b8415		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886F 10088 bytes

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