Malicious PDF — malware analysis report

Static analysis result for SHA-256 13b4e72059a8ce94…

MALICIOUS

PDF

40.4 KB Created: 2020-08-18 19:13:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c139932b603b33b505bb966e1fc2a4 SHA-1: d248f7593194a81bb7c9abc5579f738302349a02 SHA-256: 13b4e72059a8ce94e1fec11f238b87e61402ec6dede989b29267f627844a939c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that are part of a link farm, with one critical link pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing 'Whatsapp for android' and includes the malicious URL, suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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=whatsapp++for+android+2.+2.+3
    • http://gumobit.velvetmilitia.com/uploads/1/3/1/3/131383657/liruzobovuse.pdf
    • http://sidozitep.connectionsthruart.com/uploads/1/3/1/4/131437462/4865349.pdf
    • http://files.downsjuniormusic.com/uploads/1/3/0/9/130969809/0956f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/8628/0872/files/lakufedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0893/3540/files/vuzevewefewunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9445/0078/files/73996724684.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/rufemalovewexupefo.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/rixudaxelufopizuxaxobo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6001/7814/files/autopage_remote_start.pdf
    • https://cdn.shopify.com/s/files/1/0431/2806/2109/files/81492651499.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/gedofufalikomiz.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006047.bin
ddb5c5f58d1de003a7e4130d80aa67162db1963b2f585b03360bd69ccbe30592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6047 5440 bytes
font_01_sfnt_off000072d3.bin
d9df29700f460fc64127e5fc6328d6c7fc71ac752d3114068188154ec4a36dc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D3 9912 bytes

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