Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f0f07b52edc988…

MALICIOUS

PDF

45.5 KB Created: 2020-09-16 15:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f10c18d84b5a4ea57bae31ad67b3901 SHA-1: d0efbb3c54a5e3718e6e8ea3b793479952f53eb9 SHA-256: 78f0f07b52edc988c441026cd52b7e1900aa83b7bf705fc765af70be7506e473
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains URLs that are also present in the link farm. This suggests the primary purpose is to redirect users to malicious sites, likely for malware download or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.link/wix?keyword=diggy%2527s+adventure+apk+latest+version
    • http://besit.steroidsasia.net/uploads/1/3/1/6/131607062/jetijipabo.pdf
    • http://files.bayarea-interactivehypnotherapy.org/uploads/1/3/1/4/131437699/1799702.pdf
    • http://tisel.tallonresearch.com/uploads/1/3/1/4/131453329/9614264.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://58dbe4a7-685c-4e19-acd2-f8ad1f10f6e9.filesusr.com/ugd/6f9b04_90c2139f2dbb49a3b2256f5a28ee0f45.pdf?index=true
    • https://c913da80-ab33-4a44-9099-b165f8e15976.filesusr.com/ugd/f3cb45_b71fd99ba29c482092664449186df7b3.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/7326/4030/files/unlike_all_tweets.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/gufulobewovimadul.pdf
    • https://a5d07f06-8b84-4af1-bc70-3538d08590d9.filesusr.com/ugd/5f226b_4bfe915c2dff4df29b181cc9f642bb79.pdf?index=true
    • https://7bc8c8c7-fc6d-4a78-93a8-db1ce07a8f4f.filesusr.com/ugd/296484_16a1842be7164f55a50a18c6c3528d08.pdf?index=true
    • https://e44c3155-bca1-4daa-ab8a-460573827c12.filesusr.com/ugd/58a813_970dad472a4e47d593e0db25c6010caa.pdf?index=true
    • https://b9022633-4b2b-4fa0-abbb-f5f74764edb8.filesusr.com/ugd/9d869b_1165855297c04df0810056dceb8ddaaf.pdf?index=true
    • https://602d76cf-39b8-4805-a783-f5e529798ba1.filesusr.com/ugd/227d0f_41dc10072f704395a14aa51aa71f922f.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea3.bin
71c8af30aca05021475fd7fe603d5b2231969d88f0d48fa33332682b4f2c0996		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA3 5384 bytes
font_01_sfnt_off00007127.bin
bd698ca11db52a2ac198bab0fc1ff16850f3c005fbc95ecb7cb98d3bb4345a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7127 10268 bytes
font_02_sfnt_off0000946e.bin
313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x946E 16060 bytes

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