Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d785cbe2974dc9c…

MALICIOUS

PDF

33.0 KB Created: 2020-08-04 06:39:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0202647b83ffd09e9ec0a4502e55f52 SHA-1: 15242c6c0c27691a0619e878fb5c167732b6a0ed SHA-256: 8d785cbe2974dc9c9b5a2436b99d1655189f9bf3ac9193399e5ba285c87402ca
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious Link

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=application+of+buffer+solution+in+pharmacy+pdf'. Another critical heuristic identified this as a PDF link farm, with numerous links pointing to Shopify domains, suggesting an attempt to distribute or mask malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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=application+of+buffer+solution+in+pharmacy+pdf
    • http://files.joannepenn.com/uploads/1/3/1/8/131871569/3688364.pdf
    • http://files.golfmanorsynagogue.org/uploads/1/3/1/4/131437464/gafewaritusixud_jamesepo_senaz_taxikasomov.pdf
    • http://files.dekinderenhuis.com/uploads/1/3/1/8/131857540/ec87572c736a10.pdf
    • http://files.natalierasmussen.com/uploads/1/3/1/6/131606638/sabetawaxovin_filoduxusiz.pdf
    • http://files.kingdomhandymangillette.com/uploads/1/3/1/4/131453124/cdaff080253f213.pdf
    • https://cdn.shopify.com/s/files/1/0431/7793/5005/files/35592410921.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/rise_of_the_dungeon_master.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/fish_tycoon_2_magic_fish.pdf
    • https://cdn.shopify.com/s/files/1/0432/1751/8751/files/vanquishers_sword_vanilla.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/vewisiwesewagavir.pdf
    • https://cdn.shopify.com/s/files/1/0431/7901/6360/files/63714604341.pdf
    • https://cdn.shopify.com/s/files/1/0434/8664/2338/files/tuxagozozegafoz.pdf
    • https://cdn.shopify.com/s/files/1/0438/4086/4421/files/38870991953.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/lesakesaxesidek.pdf
    • https://cdn.shopify.com/s/files/1/0435/3910/3912/files/pekuze.pdf
    • https://cdn.shopify.com/s/files/1/0431/8094/9658/files/rewovegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1263/6322/files/wutojogojaxego.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/15837226603.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000456b.bin
f8ef57ca596e82e6e10f4550ffc662ce02fccf7edf1963028a41aaa3019f91b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x456B 5628 bytes
font_01_sfnt_off00005868.bin
d2214fd66f991e47254b2ae72875254b8d04341cbd3c8a0e7141bff80444c886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5868 8964 bytes

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