Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc809e984d1e033…

MALICIOUS

PDF

58.4 KB Created: 2020-08-09 11:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91973ad659ed1a109ad3a93bb3e5ca26 SHA-1: 023f1d9605078d91f24ca94f32189b93200f7219 SHA-256: 5dc809e984d1e0336962f14d10a55811b4c46d342f62b92bffc659e271f996d7
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 pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of an SEO poisoning or link farm scheme designed to lure victims to malicious sites. No scripts were extracted, but the presence of numerous links suggests a redirection-based 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.com/pify?keyword=finanzas+bursatiles+gamaliel+ayala+brito+pdf
    • http://mojigogu.buddiesbooksandbrunch.org/uploads/1/3/0/8/130874329/sokakovo.pdf
    • http://files.synergyresearchlabs.com/uploads/1/3/1/4/131438111/a4c0033e81dff3.pdf
    • http://kalud.breidholtfestival.com/uploads/1/3/1/4/131406717/mibunupuxa.pdf
    • http://files.livingmetroeast.com/uploads/1/3/2/6/132681201/lavuvimezamasaja.pdf
    • http://files.blueacesbakeshoppe.com/uploads/1/3/1/3/131380641/nosetarilolivapiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/binary_tree_class_c.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54748680829.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/38944467819.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/43996045606.pdf
    • https://cdn.shopify.com/s/files/1/0437/1991/7720/files/pubadezuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3839/9912/files/73886307805.pdf
    • https://cdn.shopify.com/s/files/1/0428/3590/2631/files/28995823327.pdf
    • https://cdn.shopify.com/s/files/1/0433/9122/1911/files/30307704741.pdf
    • https://cdn.shopify.com/s/files/1/0448/0398/1463/files/short_selling_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0439/7914/5374/files/23244998499.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2056/files/tomulorelivubapan.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/nenojenokabe.pdf
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/vejezuron.pdf
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/87719944622.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_off0000a298.bin
b548f98c694709e5a94c8ece17a8ca2b7826096001b575b17d2ab1a69dd6698c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA298 5608 bytes
font_01_sfnt_off0000b59f.bin
6f95e8b4ada10f4c5aa7e0e73ae8b7491d9374e22bff5ca4c943f741f3f20052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB59F 11516 bytes

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