Malicious PDF — malware analysis report

Static analysis result for SHA-256 443e6abe91cf0696…

MALICIOUS

PDF

44.6 KB Created: 2020-08-18 23:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5764a340b9a774db00750c42f69cbf1 SHA-1: 7f352eb99b5574907b3263d70e9ac7a5e72eda64 SHA-256: 443e6abe91cf069649e503418685a4a2a177c4b6fc8f5f4849f8d156314558be
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to a known malicious domain. The document body, though heavily obfuscated, contains the same keyword as the redirector URL, suggesting a lure for industrial equipment buyers. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=guillotine+shear+hydraulic+metal+sheet+cutting+machine
    • http://rifugalaw.westhampsteadchristmasmarket.co.uk/uploads/1/3/0/9/130969633/5411876.pdf
    • http://tovazatog.fixitpupa.com/uploads/1/3/1/6/131606407/2189272.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/how_to_justify_in_word.pdf
    • https://cdn.shopify.com/s/files/1/0428/3557/4943/files/56094669967.pdf
    • https://cdn.shopify.com/s/files/1/0439/0843/2027/files/57670170356.pdf
    • https://cdn.shopify.com/s/files/1/0428/1538/9855/files/jofotojubuf.pdf
    • https://cdn.shopify.com/s/files/1/0430/8349/7623/files/14222399135.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/fun_with_chinese_characters_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4727/files/49274543586.pdf
    • https://cdn.shopify.com/s/files/1/0434/5495/5672/files/25639430126.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/sheetz_vanilla_latte_nutrition_facts.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/nejerifipege.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2836/files/mekegegapibulidepetiverok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7193/0529/files/bitufegewudolajatimifosik.pdf
    • https://cdn.shopify.com/s/files/1/0438/6357/2635/files/printable_bible_study_guide_for_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0435/2511/1972/files/pariwenenola.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_off00006723.bin
6b74a4a4fa87bc9edc821d4caddaddd4ddc58e78ca9f8d57713ebb2544e2b975
pdf-font-stream PDF embedded font (sfnt) at offset 0x6723 5488 bytes
font_01_sfnt_off000079aa.bin
e42de5e126a634a89c5a9c10d7dd0eae14f63a8d1cdc1aa26cf555566ddb7138
pdf-font-stream PDF embedded font (sfnt) at offset 0x79AA 13852 bytes