Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee94a9be70c71d78…

MALICIOUS

PDF

39.4 KB Created: 2020-08-15 15:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19d705cd39459d057824be4dbc925718 SHA-1: ec68dbc563d28324270bfd6386936756d0de7445 SHA-256: ee94a9be70c71d78a2ef06b4e0b011629b52456b9762e7bf3a3fd9523553f900
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.cc/wb?keyword=hernia%20y%20eventracion%20pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to hernias, which is likely a lure. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious.

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.cc/wb?keyword=hernia%20y%20eventracion%20pdf
    • http://files.atxvegans.org/uploads/1/3/1/6/131606755/2146036.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/868855510.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/wesumosabafafanapaba.pdf
    • https://cdn.shopify.com/s/files/1/0441/3983/9640/files/mebuvid.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/ez_grader.pdf
    • https://cdn.shopify.com/s/files/1/0429/4544/6044/files/kedikoxuguv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1515/9458/files/add_command_nightbot.pdf
    • https://cdn.shopify.com/s/files/1/0438/5849/3600/files/57760731213.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/13987035884.pdf
    • https://cdn.shopify.com/s/files/1/0434/8031/8118/files/personality_vocabulary_list.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_off00005d40.bin
b1a8a2130922f582bcdc043650b1efbb4b23b9ba19104540c2eee77670767b48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D40 5064 bytes
font_01_sfnt_off00006e8d.bin
1caaa9b9cfab2681a751cf0eb4e95c3cc22eaa5913a3bd2fcdf07f3158f3eee6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E8D 10152 bytes

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