Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ed156b262b3a7b…

MALICIOUS

PDF

43.8 KB Created: 2020-08-09 04:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9ca3bd04e51cab085de34172aee82eb SHA-1: 89e7f938568c6b9aa7e7e1a43994f993aef975d3 SHA-256: c6ed156b262b3a7bfc8d3a036c75d6c1a66386540790846059efd3ce1656506d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a 'Biblia de estudio thompson' PDF. The presence of a large number of external PDF links, many hosted on Shopify, suggests an SEO-based link farm used to drive traffic to the malicious redirector. 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.com/pify?keyword=biblia+de+estudio+thompson+para+descargar+gratis+en+pdf
    • http://files.aeebeh.net/uploads/1/3/1/0/131070483/3a4566770f8.pdf
    • http://kisipozi.c2.ie/uploads/1/3/0/7/130776485/zufiberupiwoma.pdf
    • http://files.fultonchurchofgodinchrist.com/uploads/1/3/0/7/130740521/7201665.pdf
    • http://files.erikaehughes.com/uploads/1/3/0/9/130969082/wefaxotusegirobin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1534434062.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0843/files/pyqt_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/fuzegi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9954/3970/files/katawiwuzujapaxofobok.pdf
    • https://cdn.shopify.com/s/files/1/0437/7270/6977/files/guveku.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/24546801265.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/69217308553.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/3751739347.pdf
    • https://cdn.shopify.com/s/files/1/0432/9550/6592/files/gerokus.pdf
    • https://cdn.shopify.com/s/files/1/0434/4768/1191/files/73226685449.pdf
    • https://cdn.shopify.com/s/files/1/0440/5601/9109/files/york_diamond_80_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3748/9309/files/65613379200.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/gufeburowulebepilonur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3278/files/nadekul.pdf
    • https://cdn.shopify.com/s/files/1/0429/9236/9823/files/raxigevigoruwomezala.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_off000066cf.bin
586a4ce46689dbf7378c7039ced72b3215951f1d371f58e4bde067914f8eeccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66CF 5760 bytes
font_01_sfnt_off00007a3b.bin
ac64061fa55ea3c2ec98d20cb53b36f89fa002e1f1eb60c8e3900ad04875330f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3B 11688 bytes

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