Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d81c28c136b796…

MALICIOUS

PDF

44.8 KB Created: 2020-08-21 18:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2cb494d9fa43036fd6b67fd91eb0678 SHA-1: 4c821fada12596356a31cb8ad38443cc5e97bd1e SHA-256: e7d81c28c136b79617a8be155988dcd3f2195710e7da82eabe60a0601dfd096e
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the primary malicious URL and appears to be part of a link farm strategy, likely intended to lure users to 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.ru/pify?keyword=influenza+treatment+guidelines+%25E0%25B9%2584%25E0%25B8%2597%25E0%25B8%25A2
    • http://files.carpetcleanvancouver.ca/uploads/1/3/0/7/130776674/9233496.pdf
    • http://files.strengthindia.org/uploads/1/3/0/7/130739027/guzazemivosoze_timifejokikike.pdf
    • http://files.luzcgonzalez.com/uploads/1/3/1/6/131606890/tifepinirefenij_rexonalo_jajowoxore.pdf
    • http://files.lizannbassham.com/uploads/1/3/1/3/131383541/9516665.pdf
    • https://cdn.shopify.com/s/files/1/0462/6586/0253/files/blue_prism_rpa.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/vufemibatebuzag.pdf
    • https://cdn.shopify.com/s/files/1/0440/7679/4021/files/jetuvoxapilaxusenomijimov.pdf
    • https://cdn.shopify.com/s/files/1/0431/8570/1019/files/57768143820.pdf
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/49784535280.pdf
    • https://cdn.shopify.com/s/files/1/0431/6492/6111/files/6334292410.pdf
    • https://cdn.shopify.com/s/files/1/0430/6976/7842/files/19639584665.pdf
    • https://cdn.shopify.com/s/files/1/0433/7208/5406/files/55529050791.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/wegopurodagujuxuxoviril.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00006df0.bin
2a3aeec75e5651aeddcacfe9cce9c66fc528cc612067092b483d95f0a73bc12a		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6DF0 7268 bytes
font_00_sfnt_off00004c2e.bin
4641f4c690c5d03e099fca170cf849cfd13c2ce96de69ccaebc917b73d0581cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C2E 5212 bytes
font_01_sfnt_off00005dca.bin
82453ff4d52ee589c21405d656ef810fed2027566d5d24a126ed70e6ed4bb2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCA 6228 bytes
font_03_sfnt_off000081de.bin
f1f85c2872c746112a10979eaf38a7c29636b5378128816aada3bd597ac7f44e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DE 9812 bytes

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