Malicious PDF — malware analysis report

Static analysis result for SHA-256 6912d64162760e56…

MALICIOUS

PDF

42.2 KB Created: 2020-08-23 18:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d18e285db31c012a0adf15337bc88421 SHA-1: 886d75873fbbc43f55767c2929b1504eab87cc18 SHA-256: 6912d64162760e56e98c14660bccf7ae798e96366ca25fc1a93422b8b26e040d
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, https://ttraff.ru/pify?keyword=auto+call+recorder+free++software, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same lure and URLs, indicating an attempt to drive traffic to malicious infrastructure. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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=auto+call+recorder+free++software
    • http://files.krisjezakart.com/uploads/1/3/0/7/130776646/3219020.pdf
    • http://files.chillthepartyband.co.uk/uploads/1/3/1/4/131453989/9966247.pdf
    • http://xegisi.valleyvintagesoap.com/uploads/1/3/0/7/130738970/medavavujekoviden.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/damevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/tusubawogakadulabat.pdf
    • https://cdn.shopify.com/s/files/1/0430/4843/5861/files/rawuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/4349/4807/files/bssa_emblem_locations.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/7858431902.pdf
    • https://cdn.shopify.com/s/files/1/0427/9179/6902/files/three_types_of_blood_cells_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0450/9492/8537/files/16953559099.pdf
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/yoga_asanas_with_pictures_and_names_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71860998709.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9528/files/lexibapilejezis.pdf
    • https://cdn.shopify.com/s/files/1/0435/6515/4463/files/60628431449.pdf
    • https://cdn.shopify.com/s/files/1/0429/0487/9271/files/74318744998.pdf
    • https://cdn.shopify.com/s/files/1/0437/6471/1575/files/bible_verses_about_success_and_prosperity.pdf
    • https://cdn.shopify.com/s/files/1/0436/1617/4237/files/limisigupezu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7923/6760/files/big_ideas_math_algebra_1_student_journal.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_off0000664b.bin
fd8c85cbbc216bf7c07ee85db6a080ea2f77b17a03f1a2bf95b07ae4ae709197		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664B 5096 bytes
font_01_sfnt_off000077be.bin
41fb1d8cd8b87cbbf425bf8fd09f5f128c4d373743f03f0665180bb4599407de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77BE 10608 bytes

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