Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89622a7826a4db5…

MALICIOUS

PDF

53.8 KB Created: 2020-08-11 23:13:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31740483fc4d811df99e41b40838a529 SHA-1: ed2af04512f83c3c841fc38d242246f1ad62c0be SHA-256: f89622a7826a4db53d0bd1792c5f28744d999dfdd49e7230ff3b3d81d67ee310
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the same malicious URL. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt. The ML classifier also strongly indicated maliciousness.

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=beethoven+moonlight+sonata+1st+movement+sheet+music+pdf
    • http://files.okohstudio.com/uploads/1/3/2/6/132696194/gijilusuxikive_dixunixoxaguru_xapevizi_dowuxuk.pdf
    • http://zevisus.sharonlewis.net/uploads/1/3/0/8/130814229/4614231.pdf
    • http://files.snowypeaksoap.com/uploads/1/3/2/3/132302973/a7512c13cdce8e.pdf
    • https://cdn.shopify.com/s/files/1/0431/6200/9755/files/discord_how_to_not_ping_someone.pdf
    • https://cdn.shopify.com/s/files/1/0438/2208/8354/files/60242155107.pdf
    • https://cdn.shopify.com/s/files/1/0432/8108/8670/files/first_encyclopedia_of_science_usborne.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3414/files/41355542541.pdf
    • https://cdn.shopify.com/s/files/1/0431/1826/4469/files/69981126999.pdf
    • https://cdn.shopify.com/s/files/1/0432/7519/0422/files/86185669101.pdf
    • https://cdn.shopify.com/s/files/1/0430/8677/4436/files/diwukevenepe.pdf
    • https://cdn.shopify.com/s/files/1/0434/4211/0631/files/degradacion_y_contaminacion_del_suelo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4068/4697/files/35337734893.pdf
    • https://cdn.shopify.com/s/files/1/0432/3606/5438/files/10105050553.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7076/files/50678193269.pdf
    • https://cdn.shopify.com/s/files/1/0432/2469/4942/files/ladavabogoroz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7328/1948/files/dokenirerujakepibikume.pdf
    • https://cdn.shopify.com/s/files/1/0435/0142/0696/files/phonetic_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2277/files/rebuvogime.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_off00006beb.bin
281d0b025cb1584a2565159e5741e2c811cfedb9e844e5d597a02fc3d0cc1aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEB 5636 bytes
font_01_sfnt_off00007efc.bin
8a156c6921ca8559315ffe6b2f5f0c1990c0cc5f8b337234d191fa9e13d450e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EFC 16444 bytes
font_02_sfnt_off0000b1ca.bin
cb07af63cc967bc725defeb60e0f94def8eca5b79d09fb04145a87b09fb96d38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 16076 bytes

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