Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b3ff1cc238043a…

MALICIOUS

PDF

36.1 KB Created: 2020-08-17 12:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edeccd1ac072fd8551edffa2f96ee745 SHA-1: af7821b689ae19e9ac0ecab488e965ce42c66b83 SHA-256: 18b3ff1cc238043a516c5c742b00f81208738f11d2a50e549c42afbc31dbe06e
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO abuse tactic. One prominent URL, https://ttraff.cc/pify?keyword=channa+mereya+film++filmywap, is identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links indicates an attempt to drive traffic to potentially harmful sites.

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=channa+mereya+film++filmywap
    • http://lokemuto.ekstasis.org/uploads/1/3/1/0/131070302/kowimew.pdf
    • http://files.katherinebolynn.com/uploads/1/3/0/7/130776757/ec738cf98cef4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/wulawapidurapebikebereda.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/savozavesopopupupigajezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3315/7014/files/abecedario_ruso_y_pronunciacion.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/australian_super_balanced_performance_investsmart.pdf
    • https://cdn.shopify.com/s/files/1/0433/6268/0984/files/63437955206.pdf
    • https://cdn.shopify.com/s/files/1/0435/0610/6528/files/behaviorist_theory_on_language_learning_and_acquisition.pdf
    • https://cdn.shopify.com/s/files/1/0449/9665/7320/files/25310272905.pdf
    • https://cdn.shopify.com/s/files/1/0429/4482/3452/files/sap_businessobjects_business_intelligence.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/94403556612.pdf
    • https://cdn.shopify.com/s/files/1/0454/7146/5624/files/depression_causes_and_treatment_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/9897/1038/files/widupokilufisolusa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/pizaj.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_off00005029.bin
db266804a5c4a5ca81903a875241b9098cd80f8fb49114238c8f015d6b0e41f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5029 5064 bytes
font_01_sfnt_off00006145.bin
ad528ec42853d5d48ac85a375f70189ff615c6297d7de62a93092d43a04a67cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6145 10092 bytes