Malicious PDF — malware analysis report

Static analysis result for SHA-256 f717842079bc1fb8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-05 03:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cce004102f8144cce80e56ab6542116a SHA-1: 49ee5319766afab8b0d514bc51fbb069562163cc SHA-256: f717842079bc1fb875af39160253e257db23eb79a720c447efdfc8523e8bd76f
152 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous embedded URLs pointing to other PDF files. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=understanding+pathophysiology+6th+ed+pdf'. The ML classifier strongly indicated maliciousness. The document body appears to be corrupted or heavily encoded, but the presence of the redirector URL and the link farm strongly suggests a malicious intent, likely for SEO manipulation or distributing further malware.

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=understanding+pathophysiology+6th+ed+pdf
    • http://files.reddooracupuncture.com/uploads/1/3/1/0/131070485/f619f1df8d03b.pdf
    • http://files.naxosonlinelibraries.com/uploads/1/3/0/7/130776060/dbd1faf567f54d.pdf
    • http://jusosu.beautifulbloomer.com/uploads/1/3/1/6/131606056/nedudixebu.pdf
    • http://files.alexnewcombe.com/uploads/1/3/1/6/131606260/a75bc9c0efe0e0.pdf
    • http://xizovulaf.mariettaoddfellows.org/uploads/1/3/1/3/131380058/lavepewi-fizapukapubi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5218/7298/files/juzeremarike.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93616534700.pdf
    • https://cdn.shopify.com/s/files/1/0428/3426/4220/files/amor_eterno_acordes.pdf
    • https://cdn.shopify.com/s/files/1/0431/3029/0327/files/wekebegebapeveduvojutog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9133/6099/files/alternative_forms_of_tourism.pdf
    • https://cdn.shopify.com/s/files/1/0434/8326/7236/files/37140299842.pdf
    • https://cdn.shopify.com/s/files/1/0436/6640/7589/files/5th_and_battery_starbucks.pdf
    • https://cdn.shopify.com/s/files/1/0431/8108/0738/files/2840698731.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977390730.pdf
    • https://cdn.shopify.com/s/files/1/0429/3266/6524/files/pakal.pdf
    • https://cdn.shopify.com/s/files/1/0441/3059/9064/files/rule_34_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0436/0100/2664/files/13019512407.pdf
    • https://cdn.shopify.com/s/files/1/0440/0775/1838/files/72644618362.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/tegedojuwusenexipijuk.pdf
    • https://cdn.shopify.com/s/files/1/0434/6344/2598/files/xizuz.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/
    • https://cdn.shopify.com/s/files/1/0

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005163.bin
dd158bd4c1edef741e3e6251f226416593562e549edbbae43b0bbc9695ccb98c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5163 5548 bytes
font_01_sfnt_off00006449.bin
9c1efdf142f88de9750f206507057570284562f0d91d6a5a323efdf0d146b163		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6449 10072 bytes

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