Malicious PDF — malware analysis report

Static analysis result for SHA-256 d995e4cafa2ab394…

MALICIOUS

PDF

41.3 KB Created: 2020-08-19 14:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f60a15aedb9fcbde56fb1175fb336a3b SHA-1: 3da03ded7713a6e102a8b4b4372bf4d7bf84b55a SHA-256: d995e4cafa2ab3947e5dab4fea5e247fd152c879938e179b5f00e8f4cca48231
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the document's primary purpose is to distribute links, potentially for SEO manipulation or to lead users to malicious sites. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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=asap+medium+font
    • http://files.elevenbees.com/uploads/1/3/2/8/132815872/vuvixisedesotam.pdf
    • http://files.busenerpro.com/uploads/1/3/1/8/131856476/7778920.pdf
    • http://files.therealneverdie.net/uploads/1/3/1/3/131398419/2bd1eb.pdf
    • http://mabuno.lebonearchitects.com/uploads/1/3/0/8/130814328/jovikukupovebebem.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/koxopipovin.pdf
    • https://cdn.shopify.com/s/files/1/0428/7974/6201/files/basic_english_grammar_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0427/9926/8003/files/vavofutamexuzitomuviro.pdf
    • https://cdn.shopify.com/s/files/1/0437/1175/8491/files/61471424518.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/tumelotuxomixiselepira.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/22781694581.pdf
    • https://cdn.shopify.com/s/files/1/0437/2699/5621/files/darunotugavapu.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_off00006045.bin
8a1d29eedb66fa3593d5e00ad82e23536ac90a1ccb5e6d122924bfb24f4ea49c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6045 5048 bytes
font_01_sfnt_off00007165.bin
ea1c6ec84ba6ed0c63cf31af7acffe28700690eadacf0d9464da56d272910715		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7165 11900 bytes

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