Malicious PDF — malware analysis report

Static analysis result for SHA-256 79961f430b54d80b…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 04:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd56ee99454e93b93af49900924eb75a SHA-1: 39e3a8a0c2e90d1e66646a7cc5b0d79c4d6cde5d SHA-256: 79961f430b54d80ba281d2609272532d2c31edf19509478e48f72511df3d91e7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ttraff.cc/pify?keyword=durga+mata+ji+ki+aarti+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains references to the redirector and other PDF 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=durga+mata+ji+ki+aarti+pdf
    • http://mibok.determinedtolearn.info/uploads/1/3/1/4/131453177/305052.pdf
    • http://files.arctictreasures.shop/uploads/1/3/2/7/132740278/f780029.pdf
    • http://files.shirleywatsonfinancial.com/uploads/1/3/1/3/131381414/sumogatokakep_femim_dopibedixa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/2269/4046/files/convert_youtube_to_ringtone.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7201/files/mark_fisher_ghosts_of_my_life.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/metaphysical_anatomy_evette_rose.pdf
    • https://cdn.shopify.com/s/files/1/0438/0291/9074/files/vaduxepisisajofak.pdf
    • https://cdn.shopify.com/s/files/1/0430/0718/0954/files/algorithm_c_programming.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/60691547886.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/dusajajudasi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0103/files/beleridowanijejol.pdf
    • https://cdn.shopify.com/s/files/1/0432/9940/5977/files/fairy_tales_with_pictures_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/73357125794.pdf
    • https://cdn.shopify.com/s/files/1/0434/1592/8997/files/wozebuzujal.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/jopebaw.pdf
    • https://cdn.shopify.com/s/files/1/0430/1747/0101/files/tenasadunimasi.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/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005dcf.bin
64c684968e8662cb1a4c3acd206316b70fb8eec4364cc424dfcc61f95a45379b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DCF 5288 bytes
font_01_sfnt_off00006fc5.bin
6ce3ed3d0cf168fbf74d6eb321148d5efc31cda11559831b77020f7d4c9f4c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FC5 3740 bytes
font_02_sfnt_off00007b3f.bin
741bd50a27c323c8b07448ca0782ec4a6c63b569174943619ad80f244a890b2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B3F 9648 bytes

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