Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc844419584ee9b…

MALICIOUS

PDF

43.0 KB Created: 2020-08-06 20:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1f2440fb5f4595527801fc4c7b1523 SHA-1: b4ad72115b36273f62428682b11c0cf2825e7f75 SHA-256: dbc844419584ee9b8488a3870f1ca7a241eb82e97812882effb3046f2ee1f86a
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one heuristic specifically identifying a link farm designed for SEO manipulation. Another critical heuristic flags a redirector link pointing to known malicious infrastructure. While no scripts were extracted, the sheer volume of links and the presence of a malicious redirector suggest a delivery mechanism for further malicious content or phishing attempts.

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.cc/pify?keyword=artikel+akuntansi+biaya+pdf
    • http://files.cedardc.com/uploads/1/3/0/7/130775503/zafukowifil.pdf
    • http://levukogox.namctristate.org/uploads/1/3/0/7/130740025/9183508.pdf
    • http://files.watertheessential.com/uploads/1/3/1/4/131483307/2257862.pdf
    • https://cdn.shopify.com/s/files/1/0432/8315/3056/files/pixibolanaxejuwuxigusobe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6327/9767/files/rinawaxujofukomoguvox.pdf
    • https://cdn.shopify.com/s/files/1/0433/2909/3800/files/romanesque_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0431/2127/9138/files/punijo.pdf
    • https://cdn.shopify.com/s/files/1/0429/6228/8793/files/13806675102.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7555/files/graphics_magick_linux_installation.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/alphabetical_order_reasoning_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5778/2694/files/73346334150.pdf
    • https://cdn.shopify.com/s/files/1/0437/4990/0439/files/forensic_anthropology_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/2870/8519/files/95409850231.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/guzupozobi.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_off00006bd9.bin
097d0512a85d5e4ce55b955170704fc6d204dd799bcd08380e8731099bd0489c
pdf-font-stream PDF embedded font (sfnt) at offset 0x6BD9 5332 bytes
font_01_sfnt_off00007e12.bin
8d994af76c8e9772139495898e54a4cb2ecafefeb25fb7161ae4d132bcdf32bc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E12 9740 bytes