Malicious PDF — malware analysis report

Static analysis result for SHA-256 4349ecf5dc5d6d8e…

MALICIOUS

PDF

50.9 KB Created: 2020-07-31 14:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 249d8bf59344382c472b0876cec0012c SHA-1: 7cec0a1281ee1774df0bb80909a1261422d021a8 SHA-256: 4349ecf5dc5d6d8e4dc8bb4d1eaf96a1b3091f8f95e9b359437beff55342c0bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious File

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to a 'writing strategy pdf'. The presence of multiple embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect the user to a phishing site or download further malware.

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=r.+a.+c.+e.+writing+strategy+pdf
    • http://files.lovegrowscsa.com/uploads/1/3/1/4/131407493/6044760.pdf
    • http://files.nationalstocktradingacademy.com/uploads/1/3/1/4/131438046/mujabuxibakewiliv.pdf
    • http://files.instepdance.ca/uploads/1/3/0/7/130775732/8462695.pdf
    • http://files.newbornumc.org/uploads/1/3/1/8/131856852/jazokopunaxaxo-geburoj-nitopov.pdf
    • http://files.blendnutritionco.com/uploads/1/3/0/9/130969461/dasutoduwe.pdf
    • http://files.blendnutritionco.com/uploads/1/3/0/9/130
    • https://cdn.shopify.com/s/files/1/0438/5121/9104/files/80828037491.pdf
    • https://cdn.shopify.com/s/files/1/0431/5430/9274/files/13169159017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0427/9956/2911/files/29898730170.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4939/files/tomis.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/pivelu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/godanozuvuxefojub.pdf
    • https://cdn.shopify.com/s/files/1/0439/8697/6926/files/9891064388.pdf
    • https://cdn.shopify.com/s/files/1/0427/5725/9420/files/95748498653.pdf
    • https://cdn.shopify.com/s/files/1/0435/6653/0728/files/gomaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/5130/0517/files/57269499035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000731d.bin
80a3398af612dbecb6dcbeb8302442fb98273a48c85e79c95fd7a8df7f2d63ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731D 5204 bytes
font_01_sfnt_off000084fb.bin
50213545dd8d37c6d8c2e299aa4cb48bec6bcb6199203b19a08fe6976f5c8315		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84FB 10228 bytes
font_02_sfnt_off0000a7d1.bin
1996df2c4ae53b72149595c78431ad2c576a2ecd5f6b08b3a14fc3a1b9593d23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7D1 16620 bytes

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