Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8509d6dedde9ce…

MALICIOUS

PDF

47.6 KB Created: 2020-08-07 08:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f6b5a133ee9bd6ff009d80c0a4a5e0d8 SHA-1: dc5588aa533d3916377efd91ec93012448b6db29 SHA-256: af8509d6dedde9cec11b4b9cfd506f1c84fa7c73aac884c48e1e3c2c5ffeac8b
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically identified as a malicious redirector pointing to 'https://ttraff.com/pify?keyword=abdomen+agudo+medico+pdf'. This indicates a social engineering attempt to trick the user into visiting a potentially harmful site. The PDF also hosts a large number of external PDF links, many of which are hosted on Shopify, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly flagged this PDF as malicious.

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=abdomen+agudo+medico+pdf
    • http://jetogupu.triplecrownbaseball.com/uploads/1/3/1/3/131379012/abf929.pdf
    • http://files.therosebineclinic.co.uk/uploads/1/3/0/7/130776499/8787989.pdf
    • http://files.allisoncamerongray.com/uploads/1/3/0/8/130814611/furugubufikufe_lasur_susog.pdf
    • http://files.dailyhustle.store/uploads/1/3/0/7/130739996/vimezew.pdf
    • http://files.cf4aass.org/uploads/1/3/0/7/130740130/gafinujefugo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1455/3763/files/wings_of_fire_book_12_free.pdf
    • https://cdn.shopify.com/s/files/1/0431/1767/4656/files/types_of_coronary_artery_disease.pdf
    • https://cdn.shopify.com/s/files/1/0440/5123/4981/files/26419168452.pdf
    • https://cdn.shopify.com/s/files/1/0431/4519/9777/files/fesexirufan.pdf
    • https://cdn.shopify.com/s/files/1/0432/8770/7804/files/el_pancreas_anatomia_y_fisiologia.pdf
    • https://cdn.shopify.com/s/files/1/0434/4751/7341/files/600516581.pdf
    • https://cdn.shopify.com/s/files/1/0440/5831/2869/files/vagofagiperarivopurafo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/35662547493.pdf
    • https://cdn.shopify.com/s/files/1/0435/4211/8555/files/annihilation_script.pdf
    • https://cdn.shopify.com/s/files/1/0428/6762/2055/files/monazolufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6482/7805/files/asme_b31._3_process_piping.pdf
    • https://cdn.shopify.com/s/files/1/0434/0373/9294/files/50535663394.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d9b.bin
99ed3428ce5462108e25b6e49080d0472bc2a1fe23926db15b7df876d4d11f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D9B 5100 bytes
font_01_sfnt_off00007edb.bin
58231ddd4daa74801447750aa7fb550a98527e29ef72006ae4f112bc4f42aecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDB 11224 bytes
font_02_sfnt_off0000a374.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA374 4324 bytes

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