Malicious PDF — malware analysis report

Static analysis result for SHA-256 343b244954027d45…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 09:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92b025ceb0add5ef54d4c339ea009d74 SHA-1: cd73603873d928082c92257f0d5c0ba46dc528b9 SHA-256: 343b244954027d45b158e398a5b1f0f6c2c4a3d7ad63397f6486e865920e3836
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a PDF link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=boophilus+annulatus+pdf, is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains references to URLs and appears to be generated by wkhtmltopdf, suggesting a programmatic approach to creating the malicious document. The presence of numerous links points towards an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=boophilus+annulatus+pdf
    • http://luderadej.farmarik.com/uploads/1/3/1/4/131438541/xexavojizo.pdf
    • http://xavuge.dragonslayingprincess.com/uploads/1/3/0/9/130969754/1041c662003d5.pdf
    • http://files.gemmastanley.co.uk/uploads/1/3/1/4/131453267/retefomerab.pdf
    • http://files.chrome57band.com/uploads/1/3/1/1/131163902/8304921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6755/5481/files/sibivenezikaseritebisur.pdf
    • https://cdn.shopify.com/s/files/1/0432/2384/2983/files/can_a_chromebook_run_steam.pdf
    • https://cdn.shopify.com/s/files/1/0431/9176/3105/files/estructura_de_un_articulo_de_opinion.pdf
    • https://cdn.shopify.com/s/files/1/0435/9618/5763/files/agenda_2020_resumen.pdf
    • https://cdn.shopify.com/s/files/1/0436/4576/3737/files/hospital_administration_sri_lanka.pdf
    • https://cdn.shopify.com/s/files/1/0434/1691/2023/files/papujivipujojusabuza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/229905594.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/8919923855.pdf
    • https://cdn.shopify.com/s/files/1/0436/0624/5539/files/architectural_drawing_checklist.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5494/files/letigozadodovaximum.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/firuvor.pdf
    • https://cdn.shopify.com/s/files/1/0435/4637/8404/files/parogap.pdf
    • https://cdn.shopify.com/s/files/1/0434/7235/5478/files/xikuvewemolofuwesagamawi.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_off00007390.bin
85dc81d92f82538e69bc8d029d1d54800c3f810b33e1c28ec065b831568c9075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7390 5080 bytes
font_01_sfnt_off000084d2.bin
a4628bac6bdb1cce280d4841aa1d6f612aeffe49e3ff3207556d89f7be020d6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D2 10836 bytes

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