Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed92d39d06251982…

MALICIOUS

PDF

45.7 KB Created: 2020-07-29 16:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c37ec37f7c47a0ad98c1b9187766cbb SHA-1: 4cd113f71ceaec16bf95a831542b7a0b9e3782a4 SHA-256: ed92d39d06251982947f884270ac50fe6ec138c9409412a4620a127fbfb994ce
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, suggests a lure related to educational materials ('number bonds worksheets pdf'). The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

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.com/pify?keyword=number+bonds+worksheets+pdf
    • http://files.starkvillepride.com/uploads/1/3/1/6/131606059/bezaruwagelenog-delomukumot.pdf
    • http://files.dsmwoodwork.com/uploads/1/3/1/8/131856331/gefusemevu_tufuzasejosut_benagudabu_kegiwezo.pdf
    • http://files.samaritancreations.org/uploads/1/3/0/7/130775850/xizijivadufexa-jewuturutuke-tudozadavazimu-vososonaki.pdf
    • http://files.alyssastanghellini.com/uploads/1/3/2/8/132815004/6dd0178509c.pdf
    • http://files.lyndalriley.com/uploads/1/3/1/6/131637498/8167253.pdf
    • http://files.dsmwoodwork.com/uploads/1/3/1/8/13185633
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/13127260448.pdf
    • https://cdn.shopify.com/s/files/1/0434/5597/1492/files/57979888690.pdf
    • https://cdn.shopify.com/s/files/1/0429/1903/5033/files/95681320268.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/30189934129.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7250/files/70694247774.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/97651172031.pdf
    • https://cdn.shopify.com/s/files/1/0434/6377/0274/files/manobuxatarigoveziki.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/padibenokibafijusegarobom.pdf
    • https://cdn.shopify.com/s/files/1/0429/8529/1937/files/2786832977.pdf
    • https://cdn.shopify.com/s/files/1/0432/1669/9553/files/nafomiwebusozige.pdf
    • https://cdn.shopify.com/s/files/1/0432/7168/4252/files/98918539215.pdf
    • https://cdn.shopify.com/s/files/1/0432/8531/5737/files/rorazejovapapaguwixe.pdf
    • https://cdn.shopify.com/s/files/1/0438/4882/7040/files/77818024064.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_off000075fc.bin
21c2c64bf5ca6251a4a1002a5945f7c7c0786b6e322466f52e0cd43926223d9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FC 5140 bytes
font_01_sfnt_off00008755.bin
8d8507e32179ab2ad9691b66dc6c36053810fefb2831545b2503f02fca16985a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8755 10040 bytes

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