Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc4020630eec4a3…

MALICIOUS

PDF

60.5 KB Created: 2020-08-19 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da915734144b8d6320d43cb2514d2db3 SHA-1: 4554119c68159b37a695b48a9cb18d6b54f29fd3 SHA-256: edc4020630eec4a3b8b188a148b703f872104417118cae22077b495d5669299f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many pointing to Shopify-hosted PDFs, suggesting a link farm or SEO abuse tactic. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely leads to further 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=brigandine+grand+edition+character+guide
    • http://dufadebod.c-moreflyingschool.com/uploads/1/3/1/0/131070374/kiwefetagag.pdf
    • http://files.calliemetlersmith.com/uploads/1/3/1/8/131857602/desafowegu-nuvezujud-nunol-dalapewime.pdf
    • http://files.bardgames.org/uploads/1/3/1/3/131384286/lumurof.pdf
    • http://jowuwujod.mfavela-nutrition.com/uploads/1/3/1/3/131383679/vanoriki.pdf
    • http://files.ottawaspiritualpathways.com/uploads/1/3/0/8/130814052/mazamajexe-loxud.pdf
    • https://cdn.shopify.com/s/files/1/0431/8799/4792/files/72343461481.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6463/files/36156277044.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/androgenesis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/csgo_jump_bind.pdf
    • https://cdn.shopify.com/s/files/1/0439/1780/3675/files/ethical_leadership_book.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/adobe_air_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7902/5318/files/classical_sociological_theory_second_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/52953280568.pdf
    • https://cdn.shopify.com/s/files/1/0433/8237/4561/files/22959081159.pdf
    • https://cdn.shopify.com/s/files/1/0432/1175/1579/files/wuluzagax.pdf
    • https://cdn.shopify.com/s/files/1/0430/0200/3619/files/25949924790.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/dedorusadilonimufise.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71340125447.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_off0000aede.bin
e26732454a689b34561b1f61350ef9a13f7aaa15dee2a1bfec7000560d34a6c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDE 5040 bytes
font_01_sfnt_off0000bfef.bin
e0cacc9b1b105c9b28f3e1efd31c796bcd7797f3838aa1b4dfe7649798e54b21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 10668 bytes

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