Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c32f05ea0b8961…

MALICIOUS

PDF

54.1 KB Created: 2020-08-13 09:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf20f3785d3d5a1878e3b6d79ba6348 SHA-1: 52e6fcb59749fd54aa71d445e30bb9249515d034 SHA-256: 52c32f05ea0b8961963fb87a2d691041d5cf8edf5612ca01056e61b9eca0b5a4
152 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body itself is heavily obfuscated, but the presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic. The primary malicious URL identified is https://ttraff.cc/wb?keyword=que%20es%20el%20paludismo%20o%20malaria%20pdf.

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/wb?keyword=que%20es%20el%20paludismo%20o%20malaria%20pdf
    • http://files.yunkawasiperu.org/uploads/1/3/1/3/131379612/vizarifogumawov.pdf
    • http://files.wanderlustlilies.com/uploads/1/3/1/4/131455283/jeteloriz.pdf
    • http://xinepeke.bamfordgodfrey.com/uploads/1/3/0/8/130874435/fajisibimeroz_zabasawo_newile.pdf
    • http://files.highlightosteopaths.co.uk/uploads/1/3/0/7/130740536/lapikari-vebusewivanapu-fexipamipan-pobufujepe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/75618649740.pdf
    • https://cdn.shopify.com/s/files/1/0431/7131/5876/files/49151138507.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/basic_analog_and_digital_electronics.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/77029493005.pdf
    • https://cdn.shopify.com/s/files/1/0437/7218/2685/files/83328365583.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/after_effects_step_by_step_tutorials.pdf
    • https://cdn.shopify.com/s/files/1/0428/5225/3863/files/91447952733.pdf
    • https://cdn.shopify.com/s/files/1/0431/9831/6705/files/6570945974.pdf
    • https://cdn.shopify.com/s/files/1/0439/2216/1832/files/lawozezinikisob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/60000_milliseconds_to_minutes.pdf
    • https://cdn.shopify.com/s/files/1/0438/6013/2005/files/lejimorog.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_off00009462.bin
8b934f935e916ce2ae5aacf27de807c6d87887dfc1b317fdaa07461bd37004f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x9462 5248 bytes
font_01_sfnt_off0000a624.bin
c7c0770b3a59fcf009ac7bb73b0a531401e4c255c27d8edb5719286fcf047d31
pdf-font-stream PDF embedded font (sfnt) at offset 0xA624 10996 bytes