Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e8196f3ec01f438…

MALICIOUS

PDF

52.4 KB Created: 2020-09-01 02:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e8796bd9444b946b67b472dd94e31eb SHA-1: 18940c3f2461c223715cec7e98325992a7efd410 SHA-256: 5e8196f3ec01f4384977cac6d17997ef1e601926195e0b19e592cc6e58e84f30
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though partially corrupted, includes the same URL and references legal topics, likely as a lure. The presence of numerous external PDF links, many pointing to benign content, suggests a link farm or SEO poisoning tactic to improve the redirector's visibility.

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=california+penal+code+mandated+reporter+domestic+violence
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_496c8eb36ba64e1a8770a0d32e39d74c.pdf
    • https://static.usrfiles.com/ugd/f63f29_e2f5ef638efb46f0bbf7c572c4faf174.pdf
    • https://static.usrfiles.com/ugd/b8c837_a409acdc255f47debc86f2cbc47a36cb.pdf
    • https://static.usrfiles.com/ugd/299074_0cebbd6c8de84646983b8f115e85916d.pdf
    • https://static.usrfiles.com/ugd/90423f_c5371dec0c3443b489b7547e814321bd.pdf
    • https://static.usrfiles.com/ugd/e3834b_3e0152c7c7e7461793c01f849b0dfa1e.pdf
    • https://static.usrfiles.com/ugd/cc03df_2de50500e23f4ed18668c2961f26498a.pdf
    • https://static.usrfiles.com/ugd/18122d_d2e1a9b86423448c8c25f5aecb7d272b.pdf
    • https://static.usrfiles.com/ugd/8127dd_cc1f5d1c7ffa4d06b850165f743ee237.pdf
    • https://cdn.shopify.com/s/files/1/0431/1760/9122/files/ajeet_singh_machine_drawing.pdf
    • https://cdn.shopify.com/s/files/1/0432/5441/5520/files/juser.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/android_9_update_bluetooth_issues.pdf
    • https://cdn.shopify.com/s/files/1/0429/5596/4569/files/wiralufetobowefagiguzez.pdf
    • https://cdn.shopify.com/s/files/1/0430/0632/8995/files/levosutamulelesugaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7303/6697/files/python_multiprocessing_example.pdf
    • https://cdn.shopify.com/s/files/1/0448/0902/7735/files/27346293421.pdf
    • https://cdn.shopify.com/s/files/1/0436/3426/2169/files/the_canterbury_tales_prologue_test.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081ca.bin
c9b36ae619959385dab9d6dd68fd3de59583b79ae7ba307280ed6b583b3517cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81CA 5172 bytes
font_01_sfnt_off00009350.bin
29091fe4de368b43a9c91e451f9b05d5b3ae3ed6392379d7d9158b2cd6bac383		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9350 10324 bytes
font_02_sfnt_off0000b623.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB623 4324 bytes

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