Malicious PDF — malware analysis report

Static analysis result for SHA-256 13fa4b2e2e6b083f…

MALICIOUS

PDF

49.4 KB Created: 2020-08-29 11:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 500e935debeff39affd2c6b4b9f3c066 SHA-1: 69fe7d27c73750b4277b016ad9effa0f52b0b773 SHA-256: 13fa4b2e2e6b083f3dd050bb2ba0cfecad943ce9a7f6c288d14c3d80ac92ce25
194 Risk Score

Malware Insights

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

This PDF file contains multiple embedded links, with one pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to reference a 'facebook.py password list download' lure, consistent with credential harvesting. The presence of a 'Password-protected archive handoff' heuristic further suggests the intent is to trick the user into downloading a password-protected file, likely containing a malicious payload, after navigating through the redirector.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.ru/wix?keyword=facebook.py+password+list+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_3011a4f3a1d545b59a2c0ab3f6444fef.pdf
    • https://static.usrfiles.com/ugd/b8c837_0e3589a9194b4ce88245409ee3968dff.pdf
    • https://static.usrfiles.com/ugd/b8c837_44d2ecd20a9a48af80ae3d635c01b2a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_a573635522b04c1a9b154a6f71eb4ae0.pdf
    • https://static.usrfiles.com/ugd/824332_bced4f6d74f64f6c96005de58b4d78dc.pdf
    • https://static.usrfiles.com/ugd/b8c837_72dddff18c0a4736bcc64871d0e044ba.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e66fdcf727c4596b36f7747d3006f46.pdf
    • https://static.usrfiles.com/ugd/b8c837_f71b5057ffa44e138626de63a8734e41.pdf
    • https://cdn.shopify.com/s/files/1/0436/3455/7088/files/96019869788.pdf
    • https://cdn.shopify.com/s/files/1/0465/3006/8630/files/46226201064.pdf
    • https://cdn.shopify.com/s/files/1/0437/4275/7029/files/38102437947.pdf
    • https://static.usrfiles.com/ugd/b8c837_8df28bd05ccb41a399151a157c93f8d6.pdf
    • https://static.usrfiles.com/ugd/b8c837_8c7fedc56ae14cd1a0b5a23f58cdc1f3.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5c7bfa09f60493c9aab1eb49155bd0c.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_off00008172.bin
3511f1a61c95130a19d75ae2c8dc86e963865344ffb5fed03571bde85f90ecb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 5452 bytes
font_01_sfnt_off00009417.bin
5f08f9258f6c7c81bd521840814541e765b8eb2b23dbc480cc939584526e8176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9417 10760 bytes

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