Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23ab64c63c83e6a…

MALICIOUS

PDF

33.7 KB Created: 2020-08-19 00:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7b27f675dcc559723fe422145d694a3 SHA-1: cfcfe6334242d5af4bb7862e67451921dc1b91e0 SHA-256: c23ab64c63c83e6ad35850e0a39e706f19142a5e5e2b2836a801e18fd674acbb
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, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. This suggests the document is designed as a link farm to distribute malicious content. The ML classifier strongly supports the malicious verdict.

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=converse+plateadas+plataforma+ulanka
    • http://files.thecabinetart.com/uploads/1/3/2/6/132682790/lunepanu.pdf
    • http://files.dynamicsdanceinc.com/uploads/1/3/1/3/131379719/zalos.pdf
    • http://bokan.designmybusiness.us/uploads/1/3/0/8/130813731/74a1f.pdf
    • http://pigaw.desertbeagle.com.au/uploads/1/3/2/7/132741555/fekuzatujem.pdf
    • https://cdn.shopify.com/s/files/1/0454/1150/0200/files/93303284053.pdf
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/appearance_flashcards.pdf
    • https://cdn.shopify.com/s/files/1/0439/4264/1832/files/devaxiraluzosiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/eclipse_code_formatter_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0441/3220/4696/files/60127566201.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4204/files/56479568827.pdf
    • https://cdn.shopify.com/s/files/1/0428/4245/6231/files/cambridge_igcse_geography_past_papers.pdf
    • https://cdn.shopify.com/s/files/1/0435/7062/6723/files/59335464507.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1863/files/pejorinojuse.pdf
    • https://cdn.shopify.com/s/files/1/0438/4178/1920/files/xexopexubu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/43699821263.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_off00004696.bin
d1482c419f310bb31639c7885dc21246fc45ec9845070fb6f0a48f64b744cb7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x4696 5216 bytes
font_01_sfnt_off00005841.bin
ad12173fcb1d6b3944fe79dc8a73b208254881f31190ae1b7335cb883628433c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5841 9820 bytes