Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb39001f6d72e1e…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 01:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144a1640d9de55ffc366887545509cef SHA-1: 4dd45af05c5709214d47eb4adbd53ddcd5f435c3 SHA-256: ffb39001f6d72e1e458330798a3aa04599a4067f82e63e90fe63a18727d559b8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=non+mendelian+genetics+multiple+choice+questions+with+answers+pdf', is designed to redirect the user to potentially harmful content. The document body, though heavily obfuscated, contains this URL and other Shopify links, suggesting a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the PDF structure and embedded links strongly indicate a phishing or redirection attack.

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=non+mendelian+genetics+multiple+choice+questions+with+answers+pdf
    • http://files.insightmentalwellness.com/uploads/1/3/1/4/131406592/ce7967b28d58.pdf
    • http://files.abandonedbutnotforgotten.net/uploads/1/3/1/0/131070602/liwotawavurozora.pdf
    • http://files.fillinupmyteacup.com/uploads/1/3/0/7/130776791/a75e763419.pdf
    • http://files.staloysiuschurch.com/uploads/1/3/1/6/131637362/601794.pdf
    • http://files.guildenmordencongregationalchurch.com/uploads/1/3/1/1/131163953/sazarejadok.pdf
    • https://cdn.shopify.com/s/files/1/0438/9958/4664/files/94990894600.pdf
    • https://cdn.shopify.com/s/files/1/0437/6671/0433/files/1996057197.pdf
    • https://cdn.shopify.com/s/files/1/0431/1298/8821/files/36921371835.pdf
    • https://cdn.shopify.com/s/files/1/0435/1007/1448/files/bajug.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/61453166190.pdf
    • https://cdn.shopify.com/s/files/1/0436/4979/4213/files/56267420971.pdf
    • https://cdn.shopify.com/s/files/1/0438/9715/9832/files/25005678936.pdf
    • https://cdn.shopify.com/s/files/1/0436/5543/0309/files/35107670186.pdf
    • https://cdn.shopify.com/s/files/1/0431/6617/1297/files/34988140645.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/74500647402.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/the_dark_side_of_the_light_chasers_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/stardew_valley_ores.pdf
    • https://cdn.shopify.com/s/files/1/0440/8236/4566/files/sujutelawijisepoxeni.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_off000053cd.bin
f7e62073c00b289e1ee312dad45ef949c03ad39decd8a0c0c58589a71bc14854		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CD 5640 bytes
font_01_sfnt_off000066d3.bin
48805363d71cdf3e0dfaa017fc8444f42fa2f50c15a8d828f421293a174cd4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D3 9788 bytes
font_02_sfnt_off0000886f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x886F 4324 bytes

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