Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73c3332d83a4d43…

MALICIOUS

PDF

43.7 KB Created: 2020-10-25 23:44:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4d1448365d7da56ff02ce65621192b72 SHA-1: e917b9c84c112b2e132587d56e6ba360b92aeaf9 SHA-256: a73c3332d83a4d436a1551c3d3f92da4c504205d49d12cae4c629a94e6b448cb
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector and part of an SEO link farm, designed to lure users to malicious sites. The embedded URL `https://ttraff.com/123?keyword=android+tv+box+tx6` is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.com/123?keyword=android+tv+box+tx6 In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xetasif/anthony_giddens_sociology_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/rakidabefe.pdfIn PDF document text
    • https://s3.amazonaws.com/dujepav/12v_dc_to_220v_ac_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files/96867361110.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/prudent_investment_fund.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/4324/4200/files/jituxajubo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7153/5774/files/phoenix_bird_story_in_tamil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/8244/8541/files/brasil_tv_new_apk_download_para_pc.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/9372/8666/files/the_heart_of_betrayal_portugues_minhateca.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ea033d8-48ce-4897-b3ea-9aa233ae58d0/9116574284.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a0373f5-b4af-457e-a542-25b07b263870/4595567655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/926c2810-111c-458a-85c0-758fda48b354/jadosonatudadifarajitu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfdf2032-5a20-481a-af1f-4b887928ca01/76896367476.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/8423/2886/files/airliners_of_the_red_star.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9407/6318/files/free_colored_pencil_conversion_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/4730/5635/files/musunopajajufojawogu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/1673/0799/files/5821464515.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6135/3889/files/pulawevofiwitoseze.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x69E6 4812 bytes
SHA-256: 561fc0a9406b4ab0489819e4dff614b15289f3f10d0726ad2fd67e4720e537f7
font_01_sfnt_off00007a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5A 11952 bytes
SHA-256: 0af31cb779718f4cae76b4ca08b87ee5f88bc1c41c1a1cb61613c263ac13db70