Malicious PDF — malware analysis report

Static analysis result for SHA-256 413dc55b823e822d…

MALICIOUS

PDF

51.0 KB Created: 2020-07-27 08:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1302197ce6cb14f2915faa7cc2494ed4 SHA-1: 17e701aee3ce68430859a28d44b6c418286594c3 SHA-256: 413dc55b823e822d3d05d14bf58b89bc3d422dcbc6fe1fe56c10851f423269db
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.ru'. The document body, though heavily obfuscated, suggests a lure related to 'Shih tzu puppy care guide'. The presence of a link farm and a malicious redirector indicates an attempt to drive traffic to potentially harmful sites, likely for phishing or malware distribution.

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.ru/pify?keyword=shih+tzu+puppy+care+guide
    • http://files.techinmeded.com/uploads/1/3/2/7/132712057/kosudenolagel.pdf
    • http://files.andreaforgood.org/uploads/1/3/1/3/131382226/poluvikowerisi_zipipakura_nukowa_fuzonupovebidum.pdf
    • http://files.stepheningram.net/uploads/1/3/0/9/130969989/gunoxufisoge-lanatu.pdf
    • http://files.westrivervalleyvet.com/uploads/1/3/1/1/131164067/xatotifa-xukalidifuv.pdf
    • http://files.rurallifeatkenyon.com/uploads/1/3/1/4/131454586/1428445.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/nifopuzesukofumiguriwafa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/benubojebexoreloruva.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/81229121131.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/42614478483.pdf
    • https://cdn.shopify.com/s/files/1/0440/6624/2710/files/delifemozal.pdf
    • https://cdn.shopify.com/s/files/1/0431/0283/0745/files/puzibiwixezudopur.pdf
    • https://cdn.shopify.com/s/files/1/0432/8760/9497/files/45826535895.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2978/files/88616637956.pdf
    • https://cdn.shopify.com/s/files/1/0433/7929/4358/files/93078603288.pdf
    • https://cdn.shopify.com/s/files/1/0434/0151/1077/files/23517937784.pdf
    • https://cdn.shopify.com/s/files/1/0439/2960/0168/files/sukuwowo.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_off00008a81.bin
5792fb182890d43b9ce6581b359ae2bab75c6af4b7f9d014ef16eb098b37ffad
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A81 5048 bytes
font_01_sfnt_off00009bd0.bin
47a7933fb153759b903db15d44dc52f858e5e3d0108c7afd98e754b5420032e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BD0 10196 bytes