Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ba161f6bd2d724…

MALICIOUS

PDF

32.6 KB Created: 2020-08-30 08:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34ac99ba15bbe38bd1c1b907bd3fca78 SHA-1: a6ecff6371974226a1a6d861ccb573b106d80159 SHA-256: a1ba161f6bd2d7247fcc8aafed4dd899af80c2ff276191c631b19454b79b74d4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, disguised with text related to 'PC health advisor'. The document body also contains this URL, indicating a social engineering attempt to trick the user into clicking it. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, likely for SEO manipulation or to host further malicious content.

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/wix?keyword=pc+health+advisor+3.2.4+key
    • https://static.usrfiles.com/ugd/4b874d_76fc87d71dbd4270a01d23aa6881787b.pdf
    • https://static.usrfiles.com/ugd/9e41f0_7d0a159455e5406591ac570a5c60e60e.pdf
    • https://static.usrfiles.com/ugd/9d869b_5cdc6aef307b4d1abdd48ab5568da8e2.pdf
    • https://cdn.shopify.com/s/files/1/0429/5127/8755/files/fipanab.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/edge_of_the_empire_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0457/3695/1964/files/psionic_ascension_stellaris.pdf
    • https://cdn.shopify.com/s/files/1/0437/6238/5045/files/audio_power_amplifier_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0436/9973/2634/files/mawizozujebadetaru.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93861148098.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_off000040b6.bin
4d6dd535af46bd774ea4341e4fd5110f9cba271f70a88857f18910cc887486ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x40B6 5672 bytes
font_01_sfnt_off0000540f.bin
21e8cff0f86d4e4a25aed7e1d9fdd7a6a76f4a2aee4916e09aeb93c8f9aceb2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x540F 9976 bytes

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