Malicious PDF — malware analysis report

Static analysis result for SHA-256 be81121c55d18a37…

MALICIOUS

PDF

36.2 KB Created: 2020-08-03 03:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e0156ce39be1033fbde2dab2ac389bb SHA-1: 11bbabd541fc4c84c9a6c61b23c878245537731e SHA-256: be81121c55d18a3715393862bef6b6818bee78a4df411e81ee468559392b0a37
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Hampton bay antigua ceiling fan' and the malicious URL, suggesting a lure to a fake product page. The presence of a link farm heuristic further indicates an attempt to distribute malicious content or engage in SEO poisoning. No scripts were extracted from this sample.

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/pify?keyword=hampton+bay+antigua+ceiling+fan
    • http://files.angelicacheyennetcd.com/uploads/1/3/1/4/131453543/6b579af319a0.pdf
    • http://files.tenderpresence.com/uploads/1/3/1/4/131437005/kopepaxefinilozati.pdf
    • http://files.sterlexlabs.com/uploads/1/3/0/9/130969438/dedikolupokegaf.pdf
    • https://cdn.shopify.com/s/files/1/0438/7821/9944/files/ziribunobi.pdf
    • https://cdn.shopify.com/s/files/1/0428/1679/8883/files/14686840656.pdf
    • https://cdn.shopify.com/s/files/1/0431/5018/0503/files/linodej.pdf
    • https://cdn.shopify.com/s/files/1/0437/5340/6618/files/restart_network_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0432/8282/5371/files/zoxelupuvukonuzedibosunak.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/56177086370.pdf
    • https://cdn.shopify.com/s/files/1/0433/0808/9499/files/94347708653.pdf
    • https://cdn.shopify.com/s/files/1/0430/6590/1210/files/vimib.pdf
    • https://cdn.shopify.com/s/files/1/0440/7400/8741/files/blade_runner_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0428/7833/7187/files/1108165770.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_off00004de2.bin
a06e3cab86419a83412eee97167803572615a9986dee5db9632f83b5ee00cf6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE2 5264 bytes
font_01_sfnt_off00005fcc.bin
090e61594f42f98184f07fe2cd51bd4ac086603c40768a4829125adca4ee215e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCC 10248 bytes