Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c0c55cdc4566a5d…

MALICIOUS

PDF

53.0 KB Created: 2020-08-13 11:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2e175d3136c487daa78802ba9363acd SHA-1: 26573c46b6706f10a9a439334572a60e31ecc1ce SHA-256: 2c0c55cdc4566a5d0b0179806cddf203c1403c12cb842348f54f5c3a69bcf419
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded external links, a technique often used for SEO poisoning or to redirect users to malicious sites. One of the URLs, https://ttraff.ru/wb?keyword=definicion%20de%20patrimonio%20cultural%20segun%20autores%20pdf, is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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/wb?keyword=definicion%20de%20patrimonio%20cultural%20segun%20autores%20pdf
    • http://pawovafax.leolinbowen.com/uploads/1/3/0/7/130775897/pekixona.pdf
    • http://files.centreonc.com/uploads/1/3/1/4/131453674/lotemuvuzodabafonedo.pdf
    • http://wawunad.caribbeanshadeproducts.com/uploads/1/3/0/8/130874359/gogapogijezuvupe.pdf
    • https://cdn.shopify.com/s/files/1/0436/4494/4542/files/zapupurovar.pdf
    • https://cdn.shopify.com/s/files/1/0431/6571/2535/files/uf_housing_application.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8310/files/dopopevawowurufigixijakut.pdf
    • https://cdn.shopify.com/s/files/1/0439/4713/1035/files/similarities_between_classical_and_neoclassical_theories.pdf
    • https://cdn.shopify.com/s/files/1/0430/5358/0439/files/85219787453.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/mojuwexe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/associative_memory_in_computer_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0432/3613/0983/files/39090403075.pdf
    • https://cdn.shopify.com/s/files/1/0428/3197/0471/files/campbell_biology_in_focus_test_bank.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6249/files/lugavologa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5611/0487/files/36487636282.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/busifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5185/9616/files/sifuponunadizesopi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6798/8376/files/c_binary_serialization.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000807a.bin
8e1fbda827756003545d80dfb5e63e3ca5625f222b77e0116e011a62fb1c1076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x807A 5356 bytes
font_01_sfnt_off00009295.bin
0a875dfdb64fe139fbe33368d19c123baf0dbe0b059b3150079cec9ff02d0092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9295 11164 bytes
font_02_sfnt_off0000b6ed.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6ED 4324 bytes

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