Malicious PDF — malware analysis report

Static analysis result for SHA-256 70072e3873cb1bb0…

MALICIOUS

PDF

50.1 KB Created: 2020-07-31 14:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27de1738cbcda3e005573aab68cf1e2 SHA-1: e8ad5513f6bbfdc367e8a52b966e23c6cbe9e5a9 SHA-256: 70072e3873cb1bb016b01fcff017c1a4e9ee475f1ca2d07de58a3407251b29c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links suggests a phishing or SEO-based malicious campaign.

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=occupational+therapy+in+acute+care+pdf
    • http://files.firefallseffects.com/uploads/1/3/1/4/131453199/maruroruluki.pdf
    • http://files.bestmassagefredericksburg.org/uploads/1/3/2/6/132696155/xifadesu-xefajabak.pdf
    • http://files.jessicaleighwellbeing.com/uploads/1/3/1/3/131379320/xajojasaripunu.pdf
    • http://files.child-poverty.org/uploads/1/3/0/9/130969608/nesifekoz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4254/4533/files/lazebenoninonafupakokid.pdf
    • https://cdn.shopify.com/s/files/1/0431/4152/9754/files/61343625449.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/48082641171.pdf
    • https://cdn.shopify.com/s/files/1/0432/2207/3506/files/16712667950.pdf
    • https://cdn.shopify.com/s/files/1/0432/4527/3251/files/pepilisuxepa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8817/5519/files/gezevaponiwipimew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3429/files/60848614759.pdf
    • https://cdn.shopify.com/s/files/1/0428/7827/1641/files/91209754558.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/xuwoko.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/zajixidiriwodebaguzapusu.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1967/files/47008327698.pdf
    • https://cdn.shopify.com/s/files/1/0431/2226/2178/files/47001708110.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3832/files/96057120329.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_off000085ff.bin
5395cb11dc8642618b53a6c2923742676b9db80921852f487e66af1052401e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FF 5076 bytes
font_01_sfnt_off0000973a.bin
27bbc3854c9b379b9ea145bdf6d77ad8e11cab33422b50be4b9a7fb8589d1335		 pdf-font-stream PDF embedded font (sfnt) at offset 0x973A 10084 bytes

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