Malicious PDF — malware analysis report

Static analysis result for SHA-256 3109ff5daa521b50…

MALICIOUS

PDF

43.0 KB Created: 2020-08-05 04:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b75946d729ea2a75a1f9ad3f34668e9 SHA-1: 0b0475428155e5306a9698705118dabcd33ba11d SHA-256: 3109ff5daa521b501080d2630e3f40337402e16982d5cb4952aa38b19cd44c9e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The document body text, though partially corrupted, suggests a lure related to a 'job application cover letter template'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content. The primary malicious URL is https://ttraff.ru/pify?keyword=job+application+cover+letter+template+pdf, which likely leads to further 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.ru/pify?keyword=job+application+cover+letter+template+pdf
    • http://files.christinamarshalllmt.com/uploads/1/3/1/4/131406537/1768102.pdf
    • http://files.somersetrehab.com/uploads/1/3/1/8/131856134/vejaxif.pdf
    • http://files.hyperformancellc.com/uploads/1/3/1/3/131380546/9e48b71e4df.pdf
    • http://files.kokomotans.com/uploads/1/3/1/1/131164358/3126386.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/archenemies_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/3628/5860/files/wutele.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/paxudurajosotuzejano.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/gonijajivivodoxugot.pdf
    • https://cdn.shopify.com/s/files/1/0434/6046/0701/files/xosirosorutapulolefa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6938/2557/files/pewavodew.pdf
    • https://cdn.shopify.com/s/files/1/0435/1167/7083/files/wuwaravuxibevuwafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/wetatonaravunifusixe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2116/3941/files/41271637802.pdf
    • https://cdn.shopify.com/s/files/1/0429/8119/5927/files/pomomofupizi.pdf
    • https://cdn.shopify.com/s/files/1/0436/9442/4232/files/33749361295.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nuvororixepexovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6610/5759/files/tadenirutesiguxadijepuwu.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_off0000699e.bin
89c6e2cc80b851241bce05e6381a325ce7ba1f3af0874ef1e7b0532c259d5534		 pdf-font-stream PDF embedded font (sfnt) at offset 0x699E 5312 bytes
font_01_sfnt_off00007ba1.bin
79ff57a82b0374df5695c4c1490f5432aef21054776758a9c6b73bf1fa83364e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA1 10356 bytes

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