Malicious PDF — malware analysis report

Static analysis result for SHA-256 951e2ca69d41355f…

MALICIOUS

PDF

43.1 KB Created: 2020-08-03 15:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e50a0bdd9e3d6c1e839924c91e0f3605 SHA-1: baf39040bc0c6060dbe346800c5d2ad3ed2ece28 SHA-256: 951e2ca69d41355ff652652546024695d32a11aa2c73a5bf75e6cc8e8d2d1ef6
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a document title, aiming to lure users to a harmful site. The ML classifier strongly indicated maliciousness, and the presence of numerous external links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic. The primary malicious IOC is the redirector URL: https://ttraff.cc/pify?keyword=ornament+and+crime+essay+pdf.

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=ornament+and+crime+essay+pdf
    • http://files.beitnachum.org/uploads/1/3/1/4/131483253/ximegigojepirez_rabisosip_suwupisi.pdf
    • http://files.arinsberg.com/uploads/1/3/1/4/131406391/kolagozutemabulod.pdf
    • http://files.thefensk.com/uploads/1/3/2/7/132740467/zalakowatinamu.pdf
    • http://files.rosalindwhitephotography.com/uploads/1/3/1/3/131383649/7e102a9820.pdf
    • http://files.melanomaactioncoalition.org/uploads/1/3/1/4/131454345/wifunumu_metar_fuwalexodusogi_zogofenikux.pdf
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/felubuzodag.pdf
    • https://cdn.shopify.com/s/files/1/0430/1075/2663/files/the_gamer_manhwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/99427531891.pdf
    • https://cdn.shopify.com/s/files/1/0432/7600/9622/files/74304626910.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/10215921024.pdf
    • https://cdn.shopify.com/s/files/1/0438/7245/2776/files/zevubome.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/51983986271.pdf
    • https://cdn.shopify.com/s/files/1/0431/0971/2021/files/ngrok_invalid_host_header.pdf
    • https://cdn.shopify.com/s/files/1/0438/2828/1506/files/95624849861.pdf
    • https://cdn.shopify.com/s/files/1/0431/0482/9602/files/xagotopubuxopurovem.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/98071701402.pdf
    • https://cdn.shopify.com/s/files/1/0430/2539/9971/files/i_am_spock.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/niroduwo.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3041/files/peregukeb.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_off000069ae.bin
92f32c15eec057d85ac5f13e6d1ee23960b548f2ef8f19b808725aebd5b865e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69AE 5396 bytes
font_01_sfnt_off00007bf7.bin
d5090b6afd22652b3c99f5b80b49c551de3dbff04dbd904c30982173077a414e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BF7 10176 bytes

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