Malicious PDF — malware analysis report

Static analysis result for SHA-256 7967fa850223dee3…

MALICIOUS

PDF

44.2 KB Created: 2020-08-14 12:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d30597b1f4bf0080e6611a1caf7d3c46 SHA-1: 916a499dd056293d8050f68aa5f1cfc27bcdba5b SHA-256: 7967fa850223dee31a332425f02ca7b1a42b72bb6f07a2eb67d171e469905ffd
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with redirector infrastructure or potentially malicious content. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be a lure for 'antaranga bengali movie song free', suggesting a social engineering pretext. The primary attack pattern involves redirecting users to malicious sites via these embedded 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.cc/pify?keyword=antaranga+bengali+movie+song+free
    • http://files.desmidtbuilders.com/uploads/1/3/0/7/130739330/3274354.pdf
    • http://gutiruro.landofosllc.com/uploads/1/3/0/9/130968917/4451370.pdf
    • http://files.tfreshproductions.com/uploads/1/3/1/4/131482823/rikaf.pdf
    • http://files.allisonwickey.com/uploads/1/3/0/8/130814124/5250691.pdf
    • http://files.leftbrainwritings.com/uploads/1/3/0/7/130776861/zuvegodu-jekenidelawe.pdf
    • https://cdn.shopify.com/s/files/1/0438/0327/9517/files/79230457375.pdf
    • https://cdn.shopify.com/s/files/1/0434/5049/9222/files/kexelixerawaposiku.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2191/files/3453259243.pdf
    • https://cdn.shopify.com/s/files/1/0437/3551/5290/files/jonovusevozimarenimefum.pdf
    • https://cdn.shopify.com/s/files/1/0434/7595/9973/files/a_c_p_shiva_movie_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/kajoru.pdf
    • https://cdn.shopify.com/s/files/1/0437/4115/1386/files/59466118103.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/lidivofagazelorasuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/3519/7602/files/segezovemibu.pdf
    • https://cdn.shopify.com/s/files/1/0437/4190/5045/files/70575712743.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/6418936319.pdf
    • https://cdn.shopify.com/s/files/1/0430/7792/7072/files/57190816727.pdf
    • https://cdn.shopify.com/s/files/1/0438/5262/8118/files/kanigezesegubekukepavez.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_off0000549f.bin
cc2afec401eedac132f473925acf29722f72fa251cb66cd56f2c56f5416b7937		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549F 5276 bytes
font_01_sfnt_off0000667c.bin
d883e4786057a7cd1e0589cb6eedc2044c8256015e2d93451280620c2bdb8988		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667C 4504 bytes
font_02_sfnt_off00007500.bin
5a97146210fa8a62d9c203bd96be550ed18b592fb6b90870e6194a7adc2f0c34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7500 14840 bytes

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