Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77fc1edf6e97aa7…

MALICIOUS

PDF

38.1 KB Created: 2020-08-08 01:43:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ca2c82b1b5f8d65ddb8c39927672ec4 SHA-1: 9b6bace81737aba7df52d669234519133b72c35a SHA-256: c77fc1edf6e97aa7a30f177647e2c87481d954af52ac8ff8d388fc70c91da656
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains a large number of embedded links to other PDF files, many hosted on Shopify. One of the primary links directs to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body contains text related to 'blank map of european countries pdf', which appears to be a lure for the link farm.

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=blank+map+of+european+countries+pdf
    • http://files.foxxpoolsbycburger.com/uploads/1/3/1/0/131070539/vuxewatuvuv-poralopobavun-mijijo.pdf
    • http://files.marksoutdoors.com/uploads/1/3/1/8/131857041/xunomo.pdf
    • http://files.angelhawariart.com/uploads/1/3/2/6/132695829/0e1e2d.pdf
    • https://cdn.shopify.com/s/files/1/0433/4062/8120/files/pelubefisumonosekamo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5504/7068/files/battlestar_galactica_1978.pdf
    • https://cdn.shopify.com/s/files/1/0429/3623/8236/files/58600305982.pdf
    • https://cdn.shopify.com/s/files/1/0438/7602/4475/files/kozumovafozedivelekosedu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1395/6007/files/rujibomafite.pdf
    • https://cdn.shopify.com/s/files/1/0438/2670/8640/files/national_interest_in_international_relations.pdf
    • https://cdn.shopify.com/s/files/1/0437/6271/2728/files/prueba_catalasa_fundamento.pdf
    • https://cdn.shopify.com/s/files/1/0435/3395/9327/files/auditoria_financeira_teoria_prtica.pdf
    • https://cdn.shopify.com/s/files/1/0439/9199/0430/files/fafefizufu.pdf
    • https://cdn.shopify.com/s/files/1/0436/4818/8569/files/gubosijorojev.pdf
    • https://cdn.shopify.com/s/files/1/0436/5756/0217/files/academic_english_grammar.pdf
    • https://cdn.shopify.com/s/files/1/0436/4759/8742/files/60704104426.pdf
    • https://cdn.shopify.com/s/files/1/0433/4610/0374/files/nifivunuxima.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_off000055f8.bin
b5cac3cc885e48aa0dffb5bb2445f0b545ca42d4fb0e874482d7aee209c0ecf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x55F8 5416 bytes
font_01_sfnt_off00006851.bin
222666f37a452467b4b7d393d3e34e3e035762b3d39ac946ca4674f4f09fd485
pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 10384 bytes