Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c123321dc1dd374…

MALICIOUS

PDF

46.6 KB Created: 2020-08-14 14:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f887470441709a240ac85b34876e5283 SHA-1: 3aeb74f69bf442e870cd4b5c8295f0a35b2184d4 SHA-256: 4c123321dc1dd374e02abb45f533bf6b04f086f3f8e22328df25711c393f5e5c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF contains a significant number of embedded links, with the primary URL pointing to a known malicious redirector. This indicates a link farm strategy, likely intended to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is the primary indicator of compromise.

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=domain+and+range+worksheet%2523+10
    • http://gujanix.starlingphotographydallas.com/uploads/1/3/2/7/132740285/250184.pdf
    • http://files.futurespresent.com/uploads/1/3/1/0/131069886/666591.pdf
    • http://files.cassco.cc/uploads/1/3/1/4/131437834/111128.pdf
    • http://files.mindfulmoves.net/uploads/1/3/1/3/131384589/9308888.pdf
    • http://files.npsracing.com/uploads/1/3/1/6/131607467/talunedi-koxutif-nukofado-mexipakew.pdf
    • https://cdn.shopify.com/s/files/1/0439/1701/7256/files/37389206352.pdf
    • https://cdn.shopify.com/s/files/1/0440/4009/3846/files/46485456255.pdf
    • https://cdn.shopify.com/s/files/1/0428/1712/6563/files/38938273200.pdf
    • https://cdn.shopify.com/s/files/1/0428/2230/3911/files/zeposuririfosonifaxasati.pdf
    • https://cdn.shopify.com/s/files/1/0432/0431/3247/files/pathophysiology_of_respiratory_acidosis.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/adobe_premiere_pro_tutorial_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/0147/1388/files/21018212393.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/gurej.pdf
    • https://cdn.shopify.com/s/files/1/0439/4074/1275/files/nizedax.pdf
    • https://cdn.shopify.com/s/files/1/0435/8946/8328/files/43962810272.pdf
    • https://cdn.shopify.com/s/files/1/0428/6355/8815/files/pavibaxasowarefikesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7141/4173/files/41007357910.pdf
    • https://cdn.shopify.com/s/files/1/0428/5494/0828/files/9438390391.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b5c.bin
122837c102ad6b3d9199c3bd642999c28a932d0e0a27ad82dcc08df0527b387a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5C 5148 bytes
font_01_sfnt_off00007cc1.bin
adc027069f2a04ba803f93115b242b4b0e2df9d15b38a61fdd5c8d8289c4f781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC1 10164 bytes
font_02_sfnt_off00009f81.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F81 4324 bytes

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