Malicious PDF — malware analysis report

Static analysis result for SHA-256 62257826f7092411…

MALICIOUS

PDF

35.8 KB Created: 2020-08-04 18:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 77df43cb2b2285147941e3dadf806773 SHA-1: e26589be855c21a8af1a603439dcbdcbae8e85d5 SHA-256: 62257826f7092411c6dd71675474f25f19330efcaf9f3dd88ad1b8631e1ab84c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which is likely the primary malicious objective. The document body, though heavily obfuscated, contains the same title as the malicious URL, reinforcing the lure. No scripts were extracted, but the presence of numerous links and the identified malicious redirector strongly indicate a phishing or redirection attempt.

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=apocrifos+del+antiguo+testamento+tomo+3+pdf
    • http://files.sfvjli.com/uploads/1/3/0/8/130814172/acfbc5768ed.pdf
    • http://files.bournevalleychurches.org.uk/uploads/1/3/0/7/130776567/kubomobefaf.pdf
    • http://kagafav.jebuilders.net/uploads/1/3/1/3/131383613/golewisar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5625/1559/files/29720402211.pdf
    • https://cdn.shopify.com/s/files/1/0433/1818/2041/files/59507247213.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0429/9964/4314/files/health_calculator_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/tibuvoporonapata.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/niwajajedo.pdf
    • https://cdn.shopify.com/s/files/1/0428/7735/4143/files/39030236240.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/fonijorow.pdf
    • https://cdn.shopify.com/s/files/1/0428/6365/7119/files/fusij.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/41577591477.pdf
    • https://cdn.shopify.com/s/files/1/0433/8037/5704/files/34700302152.pdf
    • https://cdn.shopify.com/s/files/1/0441/1044/6744/files/cambodia_calendar_2020_with_holidays.pdf
    • https://cdn.shopify.com/s/files/1/0432/7286/3904/files/smoking_weed_gif.pdf
    • https://cdn.shopify.com/s/files/1/0428/5222/1091/files/12516008322.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bf7.bin
b25236f0ccc59460b1025592469c9e7aa69d95d2a057d456e30947f03ddf4176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF7 5628 bytes
font_01_sfnt_off00005f0d.bin
c50bb645c18875a683f8c13a2f7a945f6dcaa3285c33f8e934927b7e81a0205f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F0D 10260 bytes

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