Malicious PDF — malware analysis report

Static analysis result for SHA-256 7689f3ff2d8e4760…

MALICIOUS

PDF

44.6 KB Created: 2020-08-05 22:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fccec158037bd36e547dc746973c0bd5 SHA-1: c274773ac61ca286464a6006374d137928256353 SHA-256: 7689f3ff2d8e4760133313372e045cc11d3badcdff2280d7393eaaa3a074cc55
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify-hosted PDFs, suggesting a link farm designed to lure users to malicious content. The primary attack pattern involves redirecting users through the identified malicious URL.

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=luther+s+abendsegen+pdf
    • http://files.naramatamuseum.ca/uploads/1/3/2/6/132681579/4bdb98b546.pdf
    • http://files.bluebayoudesigns.com/uploads/1/3/0/8/130814205/fesepifufugozun_soterofidire_jisabilufuv_ripekusita.pdf
    • http://files.jo-ocean.com/uploads/1/3/0/9/130969686/7900856.pdf
    • http://konifiwu.fayrenaissance.co.uk/uploads/1/3/0/7/130775169/xiwuxuwisufuliruli.pdf
    • http://files.gregsmolka.com/uploads/1/3/1/1/131164312/jonoke_fusuvaru_wogotepimeg_rugoperijasenu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/31575481387.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/81184347569.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9572/files/brute_force_python_script.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/nimunusoxoxanidokisiduga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3504/1693/files/65563824702.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/botanical_names_of_vegetables_with_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0428/5313/8591/files/bulefazivefitawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/85007928759.pdf
    • https://cdn.shopify.com/s/files/1/0429/7405/2503/files/mesuzodekuwosarosof.pdf
    • https://cdn.shopify.com/s/files/1/0439/6164/7262/files/60468579064.pdf
    • https://cdn.shopify.com/s/files/1/0432/8488/9758/files/99261907477.pdf
    • https://cdn.shopify.com/s/files/1/0433/0881/0398/files/113520739.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/nazaxofazulibirejuf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9348/1889/files/77656773639.pdf
    • https://cdn.shopify.com/s/files/1/0432/5769/2320/files/lehninger_principles_of_biochemistry_solution_manual.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_off00006ed4.bin
b789b16219b926a508fac54e24ccf38bdab5858e130770a18a34b0cd91978ac4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED4 5352 bytes
font_01_sfnt_off000080fc.bin
91225bc7c7c1102fdc54934f44608e50a9d538591df7e2766ef7e9d3caa83d3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80FC 10936 bytes

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