Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f205f544f8983a…

MALICIOUS

PDF

42.7 KB Created: 2020-08-09 01:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34540e9dff3594a55f2d52d289c77374 SHA-1: e0e64ec53bc4d4a6da97b5c5e7b52fe9ce8c6e5d SHA-256: 43f205f544f8983a857349fa05a800997ad99637b7e8b66a2cad2d03197675e7
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, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains text related to 'Encyclopédie catholique théo pdf' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to download or view content via the embedded links. The primary malicious IOC is the redirector URL.

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=encyclop%25C3%25A9die+catholique+th%25C3%25A9o+pdf
    • http://gemixi.manitobaallshepherdrescue.com/uploads/1/3/2/6/132681352/7970330.pdf
    • http://files.littletheorem.co.uk/uploads/1/3/0/7/130776630/xojidifotabovefoz.pdf
    • http://files.tamarbranitzky.com/uploads/1/3/0/9/130968984/1301009.pdf
    • http://momafew.mtcwatercooler.org/uploads/1/3/2/6/132681670/8bcdbe2136.pdf
    • https://cdn.shopify.com/s/files/1/0431/4392/1820/files/online_to_autocad_converter_software_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3013/4427/files/zamarite.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/anime_child_girl.pdf
    • https://cdn.shopify.com/s/files/1/0432/4383/1458/files/87254847431.pdf
    • https://cdn.shopify.com/s/files/1/0433/2758/6472/files/korusa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5833/0786/files/skyrim_ps3_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/auditory_neuropathy_spectrum_disorder.pdf
    • https://cdn.shopify.com/s/files/1/0429/6183/0037/files/soriwubugudew.pdf
    • https://cdn.shopify.com/s/files/1/0447/4827/5863/files/que_es_quimica_organica.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/72254437970.pdf
    • https://cdn.shopify.com/s/files/1/0431/5670/1348/files/lenuwu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1369/files/rapolubumugetegiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/5556/2398/files/dufekebirabedasalufexirub.pdf
    • https://cdn.shopify.com/s/files/1/0437/7713/0647/files/giancoli_physics_7th_edition_solutions_manual.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_off0000629b.bin
a2b6bb8684f3ceb47e658003d23899995b93549b41fed7e1ea9a0810b7e2b535		 pdf-font-stream PDF embedded font (sfnt) at offset 0x629B 5296 bytes
font_01_sfnt_off00007469.bin
8a7b0d2272d6965199d06045511683a701db04d07cb6926ccd4f39c061833e17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7469 12484 bytes

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