Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda4f117af179718…

MALICIOUS

PDF

43.7 KB Created: 2020-08-09 05:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 123e59de095526cb8051acbde3a4abb8 SHA-1: f872381d19c466b89f25cae3ec3c00b4816f47bb SHA-256: cda4f117af17971868f2789d6702378a75ae5a140d90ac802da8c30510e28790
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and appears to be a lure for a PDF download, likely to redirect the user to malicious content.

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=libro+arqueologia+prohibida+pdf
    • http://files.mrfirme.org/uploads/1/3/2/6/132695384/3735952.pdf
    • http://files.stillwaterslabradoodles.net/uploads/1/3/1/4/131406075/7f3983a9693c7e7.pdf
    • http://wepadij.sweethavenhomestead.com/uploads/1/3/1/6/131637881/5168502.pdf
    • http://files.alabama-lera.com/uploads/1/3/2/7/132740743/6abfd6e75b.pdf
    • http://files.1stclasshomeopathy.com/uploads/1/3/1/0/131070072/nikapaminupol.pdf
    • https://cdn.shopify.com/s/files/1/0449/5913/7951/files/betrayal_at_house_on_the_hill_expansion.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9663/files/7764932519.pdf
    • https://cdn.shopify.com/s/files/1/0427/6974/4028/files/nipuzupujusovumobileg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2908/6876/files/fikomimakibibutalaleg.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/wamujikukiperupefi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5349/9046/files/mosfet_amplifier_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0432/2613/6743/files/39634941416.pdf
    • https://cdn.shopify.com/s/files/1/0430/2589/1479/files/math_analogies_book_1_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/4457/5131/files/the_bronze_horseman_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0435/8032/6051/files/altivar_61_installation_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/xikadakozamavagasozusaf.pdf
    • https://cdn.shopify.com/s/files/1/0444/8944/1447/files/aasimar_race_5e.pdf
    • https://cdn.shopify.com/s/files/1/0434/1491/3191/files/86101805425.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_off0000687a.bin
22e521f9a99d82157b64b3a0c559288e145b77f9459295fae1396f72c65afe47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x687A 5332 bytes
font_01_sfnt_off00007a8a.bin
7bb95bc8c9525b47a140b63011f7d1d677fe9d4c902ccb7cc86227b2dde1b680		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8A 11408 bytes

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