Malicious PDF — malware analysis report

Static analysis result for SHA-256 be42af39c0732f25…

MALICIOUS

PDF

40.5 KB Created: 2020-08-17 08:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8f71399dcefbe23f0ec2a01f666ea44 SHA-1: 0b601f28247cc12b501a64831386881cfee5909d SHA-256: be42af39c0732f2501cda65a79fb702529efb878c032738a477cdd2f3e3db9ab
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, contains text related to 'Dungeon defenders build guide' and includes the malicious URL. The presence of a link farm and a high ML classifier score further support the malicious nature of this document. The primary attack vector appears to be social engineering through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=dungeon+defenders+build+guide
    • http://files.hulowmedical.com/uploads/1/3/0/7/130776646/pularupavojab.pdf
    • http://dobat.mulvey.ie/uploads/1/3/0/7/130775162/741436cdb.pdf
    • http://files.heartofperfusion.com/uploads/1/3/1/4/131407284/ff69cf13cf6.pdf
    • http://files.ancestorsofmjr.com/uploads/1/3/0/8/130874162/nanigu_wijezerafe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/risekumomivedopela.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/81295912327.pdf
    • https://cdn.shopify.com/s/files/1/0430/3690/1527/files/22805824511.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/lulozi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1961/6935/files/pocket_guide_to_critical_appraisal.pdf
    • https://cdn.shopify.com/s/files/1/0447/9015/3365/files/risk_management_lecture_notes.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/a_case_in_point_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94260126358.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_off00006098.bin
9637eee87366addffb9d2fe629ca6b1ff15281f801ca7be2a731e34bc910e7ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 5004 bytes
font_01_sfnt_off000071ad.bin
e12f6bd6bc15e1500e68e09a03edf11b4dc679bd0622123242103a5536d82031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AD 10468 bytes

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