Malicious PDF — malware analysis report

Static analysis result for SHA-256 a651a016eb0dfb52…

MALICIOUS

PDF

44.1 KB Created: 2020-08-17 15:07:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d3ba1e7598c3204d189ed16e3148c954 SHA-1: c37e9aa732e545cdffb51f7cd9faec611fd69dea SHA-256: a651a016eb0dfb52e66f9109edcae00ef2da4b056e4efd1c389dc4a88bf0e5e3
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The presence of numerous links, including those hosted on Shopify, suggests an attempt to manipulate search engine results or to distribute malicious content through a link farm. No scripts were extracted from this sample.

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.cc/pify?keyword=cronograma+de+actividades+de+un+proyecto+informatico
    • http://files.djfndctn.net/uploads/1/3/1/6/131606056/volozokufi.pdf
    • http://files.erningscebulechon.com/uploads/1/3/1/4/131438313/lixavilaru.pdf
    • http://files.cuscp.org/uploads/1/3/2/6/132681452/xibozemir.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/ab_initio_training_material.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/tekikizufurolamitewur.pdf
    • https://cdn.shopify.com/s/files/1/0433/4911/5029/files/xevamitekir.pdf
    • https://cdn.shopify.com/s/files/1/0431/5850/3584/files/54905505943.pdf
    • https://cdn.shopify.com/s/files/1/0432/2413/7890/files/7264075088.pdf
    • https://cdn.shopify.com/s/files/1/0429/0176/6310/files/classes_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6179/files/su_alteza_serenisima_libro.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fuxojusi.pdf
    • https://cdn.shopify.com/s/files/1/0438/3126/3394/files/wipewepevifojegoxigenasu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/legarurinekevenevujit.pdf
    • https://cdn.shopify.com/s/files/1/0437/4990/0439/files/sar_of_antimalarial_drugs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b35.bin
2eba2928742572ba1e73fe2d78124588af206922874bce482f35644786153f24
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B35 5512 bytes
font_01_sfnt_off00007ded.bin
07cd3e0505bc1a094a474d0ad78dead93d6af1352ce16651208492e9703234af
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DED 10976 bytes