Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e49018d209811f…

MALICIOUS

PDF

46.5 KB Created: 2020-07-27 17:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71c5d80c7d5433062a3220cc2a89e7ab SHA-1: e90c4dc8aef43a3710da87757588bf9ad0fee6c4 SHA-256: 84e49018d209811f947a851ebc411787b6fa9e610378f0213712d6c771ce3940
162 Risk Score

Malware Insights

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

The PDF file contains numerous links, identified as a link farm, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to a 'Europass cv format template'. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=europass+cv+format+template
    • http://files.nataliabelov.com/uploads/1/3/0/9/130969751/05f6545b.pdf
    • http://files.manningartclass.com/uploads/1/3/1/8/131856134/fuviweg.pdf
    • http://files.fountainchurchtallahassee.org/uploads/1/3/2/8/132815123/4997614.pdf
    • http://files.cowtales.com/uploads/1/3/0/8/130814421/4572951.pdf
    • http://files.marlenevalefitness.ca/uploads/1/3/0/7/130775952/sinuguribu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/1848/4888/files/98595708003.pdf
    • https://cdn.shopify.com/s/files/1/0432/9439/2485/files/fakinunazexenejimasineg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2042/7157/files/8994354316.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8918/files/rufejiboni.pdf
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/28489560593.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/lovejesik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8015/5290/files/tudoxarakakazopifimavaliv.pdf
    • https://cdn.shopify.com/s/files/1/0435/7105/2703/files/46535731004.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/17547891984.pdf
    • https://cdn.shopify.com/s/files/1/0433/1126/7990/files/kesixuzasigigozobadu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1094/8254/files/nalavutidixiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1974/files/jebogopuzo.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_off00007580.bin
f29b090b64b85628bb96122dc2c99e7e388482d1178e257765fffc7659eb9d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7580 4908 bytes
font_01_sfnt_off00008644.bin
1421d044afb80d2bd7f30cff8ed8ca92c558ce401fbc466c9bd9ed775f082bab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8644 11412 bytes

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