Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c68ae56fa45779…

MALICIOUS

PDF

44.3 KB Created: 2020-07-29 08:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f04af2b0ed0ff07708de3ad495050d14 SHA-1: c496ecb68f63cef6885fd487bed25a630310d4ba SHA-256: 10c68ae56fa45779f1a8fb6d5a1f41da7d05ece31eb6ca6a8bf59df41e18622f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, including a redirector URL that is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to sheet music. The presence of a link farm and a malicious redirector indicates an attempt to lead the user to a compromised or malicious site, likely for further exploitation or phishing.

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=amazing+grace+sheet+music+for+trumpet+pdf
    • http://files.objectsofdesireuk.com/uploads/1/3/2/6/132682790/d259e4bc3da44c.pdf
    • http://files.rjcmindworks.com/uploads/1/3/2/3/132302855/negijolasediniwivim.pdf
    • http://files.brickheadsmasonry.com/uploads/1/3/1/6/131606630/5620101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/xokujibulizelolepiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/4352/0666/files/pireragugesubegujosatifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8278/4676/files/50649319446.pdf
    • https://cdn.shopify.com/s/files/1/0432/9131/2288/files/91889999390.pdf
    • https://cdn.shopify.com/s/files/1/0427/9359/9132/files/10950330059.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/52182413904.pdf
    • https://cdn.shopify.com/s/files/1/0431/5889/6802/files/83693654349.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/66093306255.pdf
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/72462071042.pdf
    • https://cdn.shopify.com/s/files/1/0437/6651/3818/files/65130871301.pdf
    • https://cdn.shopify.com/s/files/1/0433/5039/2984/files/56667557139.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_off00006e2c.bin
4732f4107fd58ea1c09979969bd1f3993e666c3c9b64f05d0fc0a4024c9da06a
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2C 5460 bytes
font_01_sfnt_off0000808b.bin
5d9a1691dbcf84f346cde631f51cc30e3c96adfb4b71cf8ecfa7b58c302bc0c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x808B 10360 bytes