Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5550274e0e8037…

MALICIOUS

PDF

45.5 KB Created: 2020-10-06 18:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 781b16e7fd698ae149ecbfae816bbadb SHA-1: 185c7b0154d5b15ab15b26b87dccac2856545223 SHA-256: 9d5550274e0e8037a17d14e7934ca44a26549a7941d4dfbd45883b0ba0c4f994
184 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One of the embedded URLs, 'https://gettraff.ru/pify?keyword=ryobi+one+plus+battery+charger', is identified as a malicious redirector. The document body, though heavily obfuscated, contains similar URL patterns, suggesting the primary purpose is to redirect users to malicious or spam content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/pify?keyword=ryobi+one+plus+battery+charger In PDF document text
    • http://gurilago.bigchipsinvestments.com/uploads/1/3/1/0/131070420/sifusepoj-dubidonumiv-xurikowofipete-xukofo.pdfIn PDF document text
    • http://files.sddn.org/uploads/1/3/2/6/132695418/vopakemuvimosu_pajisesa_natomisarabet.pdfIn PDF document text
    • http://files.annbrodyguy.com/uploads/1/3/1/4/131406722/6134946.pdfIn PDF document text
    • http://files.opticsource-bg.com/uploads/1/3/1/3/131379351/punalizodogabu_nuzojekebi_dejud.pdfIn PDF document text
    • http://files.annaroseheaton.com/uploads/1/3/1/0/131071209/9494557.pdfIn PDF document text
    • http://pujodud.benjawanbakht.com/uploads/1/3/1/6/131606758/6757674.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/328f0cd9-e171-4a2e-9435-ca48895a1a1f/82944055038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7077776c-19a5-4063-82fb-51194989e510/tudukabozarotozesidiki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f6f33a-a725-46d7-b682-f6d330118696/gifaso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024d5bc1-e81c-4a02-bef7-70ccabc124e2/getafoke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0464/7095/5166/files/first_order_half_life_example.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/chrome_touch_up_paint_for_wheels.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/9292/9437/files/no_time_playboi_carti_mp3.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/8916/1128/files/14714247582.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_off000071a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 5444 bytes
SHA-256: 516deb4325f80e5bc3410a35ce6c96c83ccec22fe4252617b987a3e6ce9e4d92
font_01_sfnt_off00008430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8430 10680 bytes
SHA-256: db7ec76e15b4d3c47164917df6dfb84474a35327811946467df07267311fd8a9

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