Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33555c154ec9e42…

MALICIOUS

PDF

44.7 KB Created: 2020-07-20 04:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eeeddf36d60555a4a453e7cf94e04a57 SHA-1: f8d72c5f79be3e4d537e4d9d0007ab1c23173516 SHA-256: f33555c154ec9e4237763a071bb2c5bfa7c7e058920580598db142c1aa14cab4
152 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.cc'. Additionally, it exhibits a PDF link farm hosted on Shopify, with numerous external PDF links. The ML classifier strongly flagged this PDF as malicious. The document body is heavily obfuscated and unreadable, but the presence of these malicious links indicates a likely phishing or malware distribution attempt.

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.cc/wb?keyword=foxpro%20wildfire%201%20manual
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • http://files.gretawc.com/uploads/1/3/1/6/131608016/5929815.pdf
    • http://files.john-creations.com/uploads/1/3/0/7/130776645/2364247.pdf
    • http://files.kcpanhel.com/uploads/1/3/2/8/132815961/1055807.pdf
    • https://cdn.shopify.com/s/files/1/0434/3929/2577/files/98821550528.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3560/files/zepanamejobitiwebiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/0821/2638/files/28145403977.pdf
    • https://napipivo.files.wordpress.com/2020/06/buvaworototimev.pdf
    • https://pejiralitoke.files.wordpress.com/2020/06/60861816049.pdf
    • https://xodixumavin.files.wordpress.com/2020/06/rekit.pdf
    • https://cdn.shopify.com/s/files/1/0431/6885/8280/files/fojejegima.pdf
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/vuziraromafo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3420/5590/files/99925674253.pdf
    • https://cdn.shopify.com/s/files/1/0429/9105/9097/files/26908773801.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5894/files/dawab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4013/files/94236903540.pdf
    • https://cdn.shopify.com/s/files/1/0431/5820/8674/files/soguzakobizososina.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/vovirujevezofiw.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/
    • https://pejiralitoke.files.wordpress.com/2020/06/6086181

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d46.bin
b3d8c1c33831688ed95791dffe7926d063d4ce8f95fe0ac5105c19d0c13db42b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D46 4980 bytes
font_01_sfnt_off00007e31.bin
2978a5a4016bc79a5fd4776f1970058e0126ed7b6a25ae10913372ddf5d65e1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E31 11412 bytes