Malicious PDF — malware analysis report

Static analysis result for SHA-256 479612c0bc1717f8…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 05:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d01fe99698e242a91be9214a3d53d43f SHA-1: 684e08f65934262f726109888e17fb8e63ff4deb SHA-256: 479612c0bc1717f829a9ec7dda3eef8772e8f0947e7c109b28546b737f93ae6e
152 Risk Score

Malware Insights

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

The PDF contains embedded links that are identified as malicious redirectors, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains text related to a 'Little Caesars job application', suggesting a social engineering lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to improve SEO for malicious content.

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=little+caesars+job+application+pdf+2019
    • http://files.nucoonrizn.com/uploads/1/3/0/8/130813531/7210178.pdf
    • http://files.atouchofclaas.net/uploads/1/3/1/8/131871849/f40894.pdf
    • http://files.stevenpaulalvarez.net/uploads/1/3/0/9/130969699/aafae1ef3.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/68708728873.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7296/files/16042814107.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/tivosebozufaxuvulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0082/files/84924744650.pdf
    • https://cdn.shopify.com/s/files/1/0431/6971/0242/files/najedirojuliwaba.pdf
    • https://cdn.shopify.com/s/files/1/0438/3870/1728/files/weather_report_online_map.pdf
    • https://cdn.shopify.com/s/files/1/0430/0419/9075/files/font_awesome_all_css_download.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_off00005a35.bin
a53f22984d6ca2fb2016bcbfe9238fe808d5b435fd6f191447178dc94d419193		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A35 5788 bytes
font_01_sfnt_off00006dee.bin
9749e642a70540fe08458b9162ffbb6272ed6f24f4b98a2e9838270fed12f2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEE 10156 bytes

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