Malicious PDF — malware analysis report

Static analysis result for SHA-256 485a20d4fce004f3…

MALICIOUS

PDF

41.5 KB Created: 2020-09-17 05:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d954d3645b2f3ac8a03143fafa735d65 SHA-1: b5311786be6c3b74d48e141d8b37ba37fc830053 SHA-256: 485a20d4fce004f34e50599c08c4befe8eb88c6ed2b825bfe4b875333f171f1e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.link/wix?keyword=blankets+craig+thompson+pdf+free'. Additionally, it features a link farm of 16 external PDF links, many hosted on Shopify, suggesting an attempt to manipulate search engine results or lure users with seemingly legitimate documents. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact payload or delivery mechanism beyond the initial redirection.

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.link/wix?keyword=blankets+craig+thompson+pdf+free
    • http://files.royaltyprint.net/uploads/1/3/0/9/130969663/da23e13b3691c45.pdf
    • http://xokofa.raquelharrington.com/uploads/1/3/0/9/130969551/wigevobagi.pdf
    • http://files.ardg.shop/uploads/1/3/1/3/131384281/tafoditababolafeb.pdf
    • http://lejegera.reeftheband.com/uploads/1/3/0/7/130739291/4483154.pdf
    • http://files.leisuretravelsrilanka.com/uploads/1/3/1/8/131872048/rikupegijakapaje.pdf
    • https://cdn.shopify.com/s/files/1/0428/1162/1543/files/dungeon_master_s_guide_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8278/files/overtime_policy_and_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0440/9258/8184/files/dexujo.pdf
    • https://cdn.shopify.com/s/files/1/0452/5283/7537/files/vazomapedaxogilawipuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0289/files/17974375704.pdf
    • https://cdn.shopify.com/s/files/1/0436/1895/9523/files/tiranonotajusivitugojewot.pdf
    • https://ceb63a8b-a578-43a5-8ac2-5142f56017bb.filesusr.com/ugd/c068f8_a247467bc2764a29aaedb2bb31e8c411.pdf?index=true
    • https://87bd2be3-48db-45d5-b646-fa34ed482961.filesusr.com/ugd/21e9e0_5e2c0fda02294aeca6fc14352a2fd1e1.pdf?index=true
    • https://f1f631f5-dc65-492d-8ca6-76289a849b80.filesusr.com/ugd/a382ee_d98e0e78bef34f1289a92d70d1d94616.pdf?index=true
    • https://529d4c79-f9e7-4b92-b34c-03d7394f95db.filesusr.com/ugd/0d089b_22c25a89f5314fbb97f51f195d690c4b.pdf?index=true
    • https://615be2a4-d551-4d76-8073-8e5ae88de49f.filesusr.com/ugd/e5d5e5_5a3764498a0a44fb8b6025b55f50bf74.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ebe.bin
5c7311390a23f158d22eb374a725d92b774a5a5d0cc28971fa6631b671d67434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EBE 5684 bytes
font_01_sfnt_off000061e5.bin
347ac585f624a001fd6d88ce35200e9d5f2fbb257d488bcc0707757f6122f51f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E5 9852 bytes
font_02_sfnt_off000083ef.bin
2c5f1a2e3d9f683f6a217a47aeaaae813f7d4ef732a5ff54a929695507d09140		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83EF 16092 bytes

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