Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d48443512d91c79…

MALICIOUS

PDF

51.1 KB Created: 2020-09-12 10:19:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03d2f09f903eda1452287a3413025ce1 SHA-1: 700b3c4c5141403b19607eab1f1321f532006252 SHA-256: 4d48443512d91c79edcce13859660dfd697fad6d411d7c7ffb512d763b9e3899
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded links, with one specifically identified as a malicious redirector pointing to 'ttraff.ru'. The document body, though partially corrupted, suggests a lure related to job applications. The presence of numerous external links, including a link farm, further indicates malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=email+body+format+for+job+application
    • http://files.hammellwinealliance.com/uploads/1/3/0/7/130775627/3780453.pdf
    • http://kedofuve.mexicofoodpantry.com/uploads/1/3/2/6/132695351/3932205.pdf
    • http://files.phimi.pt/uploads/1/3/0/8/130874394/4f570e6.pdf
    • http://files.efhstsa.org/uploads/1/3/1/4/131406412/kekavug.pdf
    • https://cdn.shopify.com/s/files/1/0431/6879/2732/files/rulejarodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8774/9525/files/template_for_bills_due.pdf
    • https://cdn.shopify.com/s/files/1/0434/0344/4380/files/zefedosakuxogokenize.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/best_free_viewer_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0431/3671/2861/files/39865381955.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/ampoule_mask_sheet_dr._119.pdf
    • https://cdn.shopify.com/s/files/1/0432/2246/6727/files/upsc_mains_answer_sheet_of_toppers_in_marathi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5145/files/buried_movie_subtitles_english.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_off00008852.bin
2b41555165fa69041f87cad05858f6898fd245ae76e454eafbc6e56c364371cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8852 5396 bytes
font_01_sfnt_off00009aa3.bin
6ea8bd0487b64fce2e766421351839930f8ce5cf8144d301ccba9abebecbda68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA3 10712 bytes

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