Malicious PDF — malware analysis report

Static analysis result for SHA-256 861b5bb2c133b2e1…

MALICIOUS

PDF

42.0 KB Created: 2020-08-29 15:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d74628232ca0271ee3bb55c850bc50ec SHA-1: 783645b1ea2880df119bfe32160d116178963479 SHA-256: 861b5bb2c133b2e1d50b441fe63d5bfa58bdcc9216b86b64dd931859a3a1f47c
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious due to a critical heuristic identifying it as a redirector link to known malicious infrastructure. Additionally, it contains a large number of embedded links to other PDF files, many hosted on Shopify, suggesting a link farm or SEO poisoning tactic. The document body contains the primary malicious URL, which is likely the initial lure.

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.me/wix?keyword=best+viewmodel+cs+go+1280x960+stretc
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/colinde_de_craiun.pdf
    • https://cdn.shopify.com/s/files/1/0438/2962/4982/files/javukutikuwuge.pdf
    • https://cdn.shopify.com/s/files/1/0440/6866/7542/files/game_of_nim_java.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/31158636601.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffdba306e8c349b2bb3b062d0249fb7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_255247082a2043cfad4a63756a91029a.pdf
    • https://cdn.shopify.com/s/files/1/0435/8910/7869/files/87556482493.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/viborovikumowenaben.pdf
    • https://static.usrfiles.com/ugd/b8c837_3c183f253f8f4238940474038910a9e3.pdf
    • https://static.usrfiles.com/ugd/b8bbd7_985a424d830d4406aa79c975c3017185.pdf
    • https://static.usrfiles.com/ugd/b8c837_6e0498905ca24b85803a9b1034aec93a.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_off00006038.bin
48783f3c577c717b8d043fd8286a277a172a5436808404333c01e101b64c0a5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6038 6148 bytes
font_01_sfnt_off0000752e.bin
63f99e8fb664c701cd8ec2fad0785198762e2fe02d49062ae496ac4c299fcc45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752E 11712 bytes

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