Malicious PDF — malware analysis report

Static analysis result for SHA-256 a59b46bbb46230e3…

MALICIOUS

PDF

37.7 KB Created: 2020-09-02 04:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e81a46058709ddfca45459c681c867c9 SHA-1: 55ef52dd6c70291a2ddbaeb1df35d25fbae794bf SHA-256: a59b46bbb46230e3427c844fb85991bbba127013dba7f81debb0e09ceb81eba7
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for school uniforms. The document body, though heavily obfuscated, contains the same URL and keywords, reinforcing the lure. The presence of multiple embedded links to benign-looking PDFs suggests a link farm or redirection strategy. No scripts were extracted, but the primary malicious activity appears to be directing the user to the malicious URL.

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.club/wix?keyword=christ+church+school+erith+uniform
    • https://static.usrfiles.com/ugd/b8c837_e023013883454fd4b69c07d462d57702.pdf
    • https://static.usrfiles.com/ugd/8c0e65_d0c67c8e36564f2f896a8ba5261b397a.pdf
    • https://static.usrfiles.com/ugd/0adedf_efa7903b6ed844be8f4698c9a11ff9ca.pdf
    • https://static.usrfiles.com/ugd/c345b0_9467fa77e6a741118e423b33e556ef37.pdf
    • https://cdn.shopify.com/s/files/1/0432/4478/1735/files/merutuzogata.pdf
    • https://cdn.shopify.com/s/files/1/0434/0059/3557/files/92134577406.pdf
    • https://cdn.shopify.com/s/files/1/0430/0839/3369/files/26318893886.pdf
    • https://cdn.shopify.com/s/files/1/0466/5842/0901/files/firefox_version_51_for_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/38491171289.pdf
    • https://cdn.shopify.com/s/files/1/0436/3390/1726/files/65614126122.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_off00005867.bin
d03de427efba1ca475b39f273a215f5131fab14f12d177bd9c37f6391f8e83dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5867 4816 bytes
font_01_sfnt_off00006897.bin
c9675a28316c4a34488f7856d150925b670190959a15736a662760e0487543ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6897 9936 bytes

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