Malicious PDF — malware analysis report

Static analysis result for SHA-256 de099fba19c120d3…

MALICIOUS

PDF

38.2 KB Created: 2020-09-16 17:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f1d85401487ebdfa65edb7a73ebb67a SHA-1: 8d48aafe70b3fd10560a2d19c4bf9f92d211d94a SHA-256: de099fba19c120d324483a3ce2e28072fe3074f20fdcd4f7e0c1b5c291c8f7d4
152 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector, which is designed to lead users to potentially harmful content. The document body, though heavily obfuscated, contains text that appears to be a lure for search engine traffic, specifically mentioning "Chemquest 2012 answers". The presence of a large number of external PDF links further suggests a link farm or SEO manipulation tactic. No scripts were extracted from this sample.

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.club/wix?keyword=chemquest+2012+answers
    • http://sigaxoxuv.maiaseats.com/uploads/1/3/1/3/131398285/5816625.pdf
    • http://files.pickpocketensemble.com/uploads/1/3/2/7/132712530/2283486.pdf
    • http://files.sonus-pedals.com/uploads/1/3/1/3/131379991/sikigelirafek.pdf
    • http://natuto.the-blessedseed.com/uploads/1/3/1/4/131413418/zasotizizekalagiwe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7716/3426/files/waxomisosaxan.pdf
    • https://cdn.shopify.com/s/files/1/0436/8410/2297/files/kendo_grid_sortable_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/blood_of_wonderland.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/37102058162.pdf
    • https://0e637bb3-57a0-4996-a09f-537da1a0eb8f.filesusr.com/ugd/685707_9b7602275d38479cb756589a88d65ebb.pdf?index=true
    • https://2af5fd6b-6b30-4d5c-9418-1eb11e355ec6.filesusr.com/ugd/45fd81_8c0798ae50b04ee0a7292dead9011494.pdf?index=true
    • https://f361391c-03e1-489b-9abb-eedc3136172b.filesusr.com/ugd/ee9d3f_f4499725e89b4e75b862863027217dec.pdf?index=true
    • https://54b6e866-33b5-4fff-b700-68334175a47d.filesusr.com/ugd/9904c2_1890c9d1d483431e9940b1aa858b6637.pdf?index=true
    • https://4c9a711e-0e3f-4450-96a2-2ce2ca227261.filesusr.com/ugd/668a47_35a9d44aeb2043d995409697b093e9c7.pdf?index=true
    • https://17cdd1ac-c655-4708-b03f-5ec1de972094.filesusr.com/ugd/e2a635_195bfdc2238940b1ad4bb553bd7fb5b0.pdf?index=true
    • https://d1946ad7-a2d3-44e1-9580-4a1c2544556e.filesusr.com/ugd/8e7730_7bbc749e12934dcfa631470a4c15dd7b.pdf?index=true
    • https://6beea87c-9120-4f00-b486-47693be426c1.filesusr.com/ugd/417718_66e7bf1c604d46c6a3e4eaac38e475ec.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fbf.bin
0f8e670178eb88939ac753d17842e14dde35914c4bcff8ad55731ac6350253e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FBF 5340 bytes
font_01_sfnt_off000061d4.bin
ff290b8651bb0f015b9b26d90ce7ec24263cc42076d2f5d75f3c3308fda567d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D4 13552 bytes

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