Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f81b2c9d8fda77…

MALICIOUS

PDF

35.3 KB Created: 2020-08-11 04:42:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea46602acd1fd82408777eb277349ab0 SHA-1: 1c8088c6e08f04ec3eda443f85efb7bfc6c55767 SHA-256: b6f81b2c9d8fda7704bbe7ffea3fc7a64e2c94381d1565e82718dc8a4b9c2814
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, includes text suggesting a lure for a 'free download' and the malicious URL. The presence of a link farm further indicates an attempt to distribute malicious content or SEO spam. No scripts were extracted, but the primary attack vector appears to be social engineering via deceptive links.

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=instant+notes+in+genetics+pdf+download
    • http://files.evolvetogetherpdx.com/uploads/1/3/0/7/130776344/0a782a23e8ec9.pdf
    • http://gepuw.mirageband13.com/uploads/1/3/0/7/130738943/be5652d037c.pdf
    • http://duzus.dynastynparadise.com/uploads/1/3/0/7/130740141/sutokotubeki-vipogow-febugabilibe-dogujifiwaf.pdf
    • http://niwem.bctstudentassociation.org/uploads/1/3/1/1/131164239/4505312.pdf
    • http://files.moirajo.com/uploads/1/3/2/7/132710655/6052939.pdf
    • https://cdn.shopify.com/s/files/1/0428/7106/2684/files/munijifodovamegivamekupad.pdf
    • https://cdn.shopify.com/s/files/1/0432/5870/8136/files/trinity_gm_commands.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7925/files/cours_logique_squentielle_bascules.pdf
    • https://cdn.shopify.com/s/files/1/0434/6095/2229/files/31744643283.pdf
    • https://cdn.shopify.com/s/files/1/0432/5805/2763/files/monstrous_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/vadewegap.pdf
    • https://cdn.shopify.com/s/files/1/0437/1401/9496/files/firedojet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0687/files/66354547004.pdf
    • https://cdn.shopify.com/s/files/1/0435/3009/2712/files/zenojulovewo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4363/3822/files/nekoniwavexiworezemekoli.pdf
    • https://cdn.shopify.com/s/files/1/0431/0358/4409/files/76912830906.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/routing_number_065000090.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4949/files/weider_home_gym_exercise_chart.pdf
    • https://cdn.shopify.com/s/files/1/0433/5029/4678/files/nedubupikejin.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/gorezuligufupuxininuzo.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_off00004c99.bin
b52aee913f6239b4a99c8f56be5cddc350aa57b1e01df345383aa6e28b1eb789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C99 5256 bytes
font_01_sfnt_off00005ea0.bin
c03f0a596904d4792d47fee9cbf9b4a934a4915d217cc5268a268e1fdcde1d94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA0 9740 bytes

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