Malicious PDF — malware analysis report

Static analysis result for SHA-256 813fbeb78968352d…

MALICIOUS

PDF

41.4 KB Created: 2020-09-18 03:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5640900c74fec1e1b0e979b060427595 SHA-1: ba16d15518cd96aed0da0f22e9fabf6d83217af9 SHA-256: 813fbeb78968352d927836f9fefad978d590aa27ff21e0df43b7b6cfb104d175
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one identified as a malicious redirector. The heuristic firings indicate a link farm designed to direct users to external resources, with one URL pointing to known malicious infrastructure. The document body, though heavily obfuscated, contains a reference to the malicious URL, suggesting an attempt to disguise its true nature.

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.me/wix?keyword=henrico+county+public+schools+math
    • http://files.newportnewslinks.org/uploads/1/3/1/4/131407233/65b10e879fb321.pdf
    • http://jilojin.kurstudios.com/uploads/1/3/2/7/132740214/452e5227251.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0483/1890/6523/files/50475742046.pdf
    • https://cdn.shopify.com/s/files/1/0432/8862/5302/files/66227019415.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6561/files/wordly_wise_book_5_lesson_2_answers.pdf
    • https://02d87442-abde-4d03-8c1d-3a833a337aa6.filesusr.com/ugd/3225da_cfbc8eb8ebae4a98b2a1e2ce338c3a99.pdf?index=true
    • https://4684c740-c4c6-4dbd-ab43-b97bb4ec597b.filesusr.com/ugd/33a16d_1827a23d4b5444f7bd060dad9d03f09e.pdf?index=true
    • https://e7cb2f4e-a419-40c4-9e05-0854bf2268b1.filesusr.com/ugd/4dbf3f_2a4fe7a8f12a45afb8dc244d1496f3bd.pdf?index=true
    • https://78890d2c-90c5-4116-ac89-507caae57dfc.filesusr.com/ugd/34e21e_408a93677bac4bd8a679d5695536a8ae.pdf?index=true
    • https://99044b79-4afd-4cc0-9c48-7a0de9246ab3.filesusr.com/ugd/ac8c68_903b9eb2ea75402a83c7b351962b9535.pdf?index=true
    • https://6c10ab47-049f-4c9d-9d92-140677bb980b.filesusr.com/ugd/fa32a6_35db08c08cf743cbbd158a048498a13e.pdf?index=true
    • https://70457316-ecc9-479d-95fc-b1fb60f57f54.filesusr.com/ugd/460efe_8825e43f33974406baf1e97c069606ef.pdf?index=true
    • https://fc5c3413-3562-4a02-a144-10486dc6045c.filesusr.com/ugd/1cc7e8_7df71748157540b3a8df613de9b17b51.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006275.bin
ea274c89fd6a9872595a11a7234b047099ecf730c7d08c0efd90bee1d828d5de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6275 5376 bytes
font_01_sfnt_off00007490.bin
d2957d7e49942614b978dc077bcebd0f017bd453adfeedd3875b3ff29df54f56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7490 10716 bytes

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