Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a79984f1df89be…

MALICIOUS

PDF

65.9 KB Created: 2020-08-29 22:45:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: efcba2ad7b667289f813d385aff2ff87 SHA-1: 7e2f9997df9dac7504c4d716e8d20e0b015d65d1 SHA-256: 25a79984f1df89be125952f7179973343c4da975a79b3c2054db63e2286226a4
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.ru/wix?keyword=midi+to+mml, which is likely used to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=midi+to+mml
    • https://cdn.shopify.com/s/files/1/0459/1924/0341/files/84665248511.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3199/files/already_yet_just_ever_never_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/67502513276.pdf
    • https://cdn.shopify.com/s/files/1/0462/0972/8665/files/kaabil_full_movie_free_hd.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/cardiac_surgery_essentials_for_critical_care_nursing_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/15217054300.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13879903487.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/anais_nin_henry_y_june.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/98412942057.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/msds_ammonia.pdf
    • https://cdn.shopify.com/s/files/1/0428/1512/7708/files/limesudakaxixiwewev.pdf
    • https://cdn.shopify.com/s/files/1/0429/7709/9935/files/biriyani_movie_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/employment_contract_renewal_letter_sample.pdf
    • https://cdn.shopify.com/s/files/1/0434/0511/5544/files/introduccion_al_metodo_cientifico.pdf
    • https://cdn.shopify.com/s/files/1/0440/6666/8694/files/zudufobibujilaxonusoji.pdf
    • https://cdn.shopify.com/s/files/1/0433/5098/2805/files/cerebral_arteriovenous_malformation_in_pregnancy.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c18.bin
5dd70d8affe31f57949717a87addec8cbd899769d3bb5571824c343b759f5b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C18 21028 bytes
font_01_sfnt_off0000bf5f.bin
db0e466b5c0805fa0d6170c9139cfc5b5790293975badd28e8143a3d285cc986		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5F 4492 bytes
font_02_sfnt_off0000ce99.bin
d198ccb76e03e3bfe1fe7831187a27d6ad7f71bca6b127088ee12aefd2db4e0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 13952 bytes

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