Malicious PDF — malware analysis report

Static analysis result for SHA-256 6141a1f71623867e…

MALICIOUS

PDF

50.8 KB Created: 2020-08-12 17:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c877c9db2001c272591cbec27ebfd1ce SHA-1: 9ae4647499d3bbd33e6fe51886c7cc103b9e3bc4 SHA-256: 6141a1f71623867e875cfec4c42ed7562fb959262170df519c76bedf30ff969c
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a grammar-related document. This suggests a phishing or scam attempt to redirect users to malicious content. The presence of numerous external PDF links further indicates a link farm strategy, likely for SEO manipulation or to host 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.ru/pify?keyword=el+genitivo+saj%25C3%25B3n+en+ingl%25C3%25A9s+pdf
    • http://files.masterchefoneill.com/uploads/1/3/1/6/131606046/nusobizori-tipuwovixovuzi.pdf
    • http://jubafe.mdvcorp.com/uploads/1/3/1/3/131383309/junisano_sopebezolejumik_wupex.pdf
    • http://files.benandninamba.com/uploads/1/3/0/8/130813132/859b0e8a65.pdf
    • http://files.eswirdeinmal.com/uploads/1/3/1/4/131438557/juseruzusu.pdf
    • http://files.paminingprofessionals.org/uploads/1/3/0/7/130775182/lexopuxadake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/fozofupi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8132/5978/files/kobuboxololetotojojeridox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4349/5842/files/transistor_amplifier_theory.pdf
    • https://cdn.shopify.com/s/files/1/0439/4817/9611/files/jizosopoxajutuw.pdf
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/badesepuvenom.pdf
    • https://cdn.shopify.com/s/files/1/0433/8899/3699/files/nubuzilisetomijawifigeb.pdf
    • https://cdn.shopify.com/s/files/1/0435/8920/6174/files/xagag.pdf
    • https://cdn.shopify.com/s/files/1/0427/4782/2236/files/principles_of_algebraic_geometry_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1014/files/faxuxudijokasuxonosagik.pdf
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/73385397632.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7046/files/76580910644.pdf
    • https://cdn.shopify.com/s/files/1/0429/9672/7957/files/97522459827.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bc6.bin
b00f5b8843f77caa5ed60ba0c3868ae811c15cbc8939eb5a6cc0708e627fc710		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC6 5484 bytes
font_01_sfnt_off00008e06.bin
e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E06 1800 bytes
font_02_sfnt_off00009694.bin
4e494102f4183697515a585211e2c36f3bc2dc26f171fe1b8f2f7d4e84139070		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9694 11552 bytes

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