Malicious PDF — malware analysis report

Static analysis result for SHA-256 b911c293dc601688…

MALICIOUS

PDF

45.8 KB Created: 2020-08-06 12:09:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39d595b62ac2d3776f8542b240000e17 SHA-1: 2b19f7d41741f40946b8952783074fdb807af825 SHA-256: b911c293dc6016880f58fa6874cfbaec49dfb91ab002052c9cfaeb4943537c0b
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.cc/pify?keyword=les+analyses+m%25C3%25A9dicales+pdf, which is a known malicious redirector. The presence of numerous embedded links, many pointing to Shopify domains but likely serving as a distraction or part of a larger SEO poisoning scheme, suggests an attempt to lure users to 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.cc/pify?keyword=les+analyses+m%25C3%25A9dicales+pdf
    • http://files.lacombenajac.com/uploads/1/3/0/7/130776230/vatazazuzorazor.pdf
    • http://files.ghschorus.com/uploads/1/3/2/6/132681337/jupasa.pdf
    • http://files.rhythms-of-grace.org/uploads/1/3/1/4/131437930/3570436.pdf
    • https://cdn.shopify.com/s/files/1/0434/5852/7397/files/jukudigolegumal.pdf
    • https://cdn.shopify.com/s/files/1/0429/6366/5062/files/92901212188.pdf
    • https://cdn.shopify.com/s/files/1/0436/3943/9510/files/68631003626.pdf
    • https://cdn.shopify.com/s/files/1/0435/1927/9259/files/24870823233.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8333/files/61728175783.pdf
    • https://cdn.shopify.com/s/files/1/0435/2504/6431/files/2020_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/3036269553.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5060/files/zuromoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tedix.pdf
    • https://cdn.shopify.com/s/files/1/0431/3825/2957/files/40924978982.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pekazojifedabefotekufof.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/86343911252.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/xavebiralo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3644/1752/files/boyce_diprima_differential_equations_10th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/92337015431.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_off0000711f.bin
a0a0f858c757a78ae9cf9b17e2a8dc1d62f026ba78191f0b563771d0b0ff0d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x711F 5392 bytes
font_01_sfnt_off00008331.bin
339736f981446ce152badc0919018d8b31d2f99ee30579df77b17d25c90d91ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8331 11784 bytes

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