Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a3bb6745c63ebf…

MALICIOUS

PDF

44.7 KB Created: 2020-08-06 02:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0490495e457e5ce8a2f949fce9ddf56 SHA-1: 2114886daa8c608779f1428470d6c4dc209821e3 SHA-256: 71a3bb6745c63ebf7baf3b33b36b731a2489de6e7843299187a422a6bd387527
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, specifically for containing a link farm and redirecting to known malicious infrastructure. The embedded URLs, such as 'https://ttraff.cc/pify?keyword=bengali+to+english+translation+book+pdf+free+download', are designed to lead users through a series of redirects, likely to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to these URLs, reinforcing the malicious intent.

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=bengali+to+english+translation+book+pdf+free+download
    • http://files.8bits4ever.com/uploads/1/3/2/8/132814166/ralafipig.pdf
    • http://files.learningslowly.co/uploads/1/3/0/7/130776262/kadexe.pdf
    • http://files.heart2heartfs.org/uploads/1/3/1/8/131857305/5666517.pdf
    • http://files.corinewood-donnelly.com/uploads/1/3/0/9/130969298/d1051.pdf
    • http://files.davidybkaufmann.com/uploads/1/3/0/7/130775320/7430368.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5018/0514/files/41812480964.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/riret.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4981/files/xuvowanuwij.pdf
    • https://cdn.shopify.com/s/files/1/0434/9414/6200/files/nagagudurerad.pdf
    • https://cdn.shopify.com/s/files/1/0437/4865/5265/files/assembly_language_programming_in_8085_microprocessor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/58832639319.pdf
    • https://cdn.shopify.com/s/files/1/0438/2782/2752/files/capacity_management_policy.pdf
    • https://cdn.shopify.com/s/files/1/0433/3672/8744/files/80782569005.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/35969064166.pdf
    • https://cdn.shopify.com/s/files/1/0440/8282/3320/files/28892142607.pdf
    • https://cdn.shopify.com/s/files/1/0430/1540/5725/files/10555245832.pdf
    • https://cdn.shopify.com/s/files/1/0435/3431/9776/files/53000536415.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d3e.bin
309bfe4dd6987b4302a8fcfcf93d094c9208823904418d4669c84978064aa3e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3E 5648 bytes
font_01_sfnt_off0000707a.bin
debe6b5751ecee02a632a4d365dc6f3d9954f772362e9a17fb239842d3ac18fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707A 5288 bytes
font_02_sfnt_off000081be.bin
98721c2eb245ff7ac36deb54947b79aed1f1ef4830517a931636d2954c8569a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81BE 10296 bytes

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