Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b5e873dd17fce3…

MALICIOUS

PDF

41.1 KB Created: 2020-08-02 12:41:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 111196d99fb9fb231e4d566d81f25eff SHA-1: 207d24477d00486e4811388ce226c4b49d060d62 SHA-256: 69b5e873dd17fce38ac8550ac28c9dd30fc3f68cfd19e42a9a7add10babaaddf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, including the malicious redirector https://ttraff.ru/pify?keyword=2620%253A+9b%253A+1900%253A+1 and numerous links to Shopify-hosted PDFs, suggesting a link farm or content distribution network for 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.ru/pify?keyword=2620%253A+9b%253A+1900%253A+1
    • http://files.coachboggsrunning.com/uploads/1/3/1/4/131437503/972958f77bae9a.pdf
    • http://files.lmcfeely.com/uploads/1/3/2/3/132302963/pibasaxe.pdf
    • http://files.elsewiseart.com/uploads/1/3/1/3/131383651/7498293.pdf
    • http://files.nicoleehiltz.com/uploads/1/3/2/8/132814306/sowezasetabazin-zerisanibeleliv.pdf
    • http://files.dunphyshandguntraining.com/uploads/1/3/2/6/132681566/d354c601d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1764/1879/files/jisomegaferugojifafuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/deluko.pdf
    • https://cdn.shopify.com/s/files/1/0437/3993/8970/files/fusero.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/leraruxorowikibigijoxek.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/kigogi.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6600/files/8163934174.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/85154339257.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/dajezofobizisufilibonoje.pdf
    • https://cdn.shopify.com/s/files/1/0432/5461/2123/files/jisawetofuziribifat.pdf
    • https://cdn.shopify.com/s/files/1/0432/2865/9874/files/jquery_1._11_3_min_js.pdf
    • https://cdn.shopify.com/s/files/1/0439/0469/6472/files/ti_84_interpolation_program.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/35090822937.pdf
    • https://cdn.shopify.com/s/files/1/0438/7156/8040/files/sugukubenojifawetanu.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_off00005afb.bin
2e300126e8516aa24806a6fc9f74c9900b7f32d0a44d32dc5714f6465460bb77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AFB 4896 bytes
font_01_sfnt_off00006bbd.bin
7e14dab067e39bd10460bacdbdab08287fa61f5842167d017ec71adcba3da055		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BBD 13996 bytes

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