Malicious PDF — malware analysis report

Static analysis result for SHA-256 40adb188dd9d499a…

MALICIOUS

PDF

69.7 KB Created: 2020-07-22 14:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec6b4eb649f7f13390a7f96cd958ff3 SHA-1: 4fe782021567f0f03ed1b678bef7ce62f92121ca SHA-256: 40adb188dd9d499a327c70e5c39d902ff2ea2ccaddf4440133753b4ea63e9893
152 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to its use of a link farm, which hosts numerous external links, many pointing to benign Shopify domains but ultimately redirecting to a malicious URL. The primary malicious URL, 'https://ttraff.ru/wb?keyword=iliada%20e%20odisseia%20em%20pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, suggests a lure related to literary works to entice users to click the 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.ru/wb?keyword=iliada%20e%20odisseia%20em%20pdf
    • http://files.centralcalclay.com/uploads/1/3/1/6/131606256/5a688.pdf
    • http://files.carolyncardinet.com/uploads/1/3/1/3/131379759/vipev_lolapuzafuf_zitezadop.pdf
    • http://files.cold-war-racers.com/uploads/1/3/1/4/131437181/1492991.pdf
    • http://files.sugarlandpremierroofing.com/uploads/1/3/2/3/132303282/8671159.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/kobejup.pdf
    • https://cdn.shopify.com/s/files/1/0437/2309/6216/files/gasapisagufotoludojer.pdf
    • https://cdn.shopify.com/s/files/1/0437/5432/4117/files/25288836430.pdf
    • https://cdn.shopify.com/s/files/1/0429/2358/9788/files/wovawoleguluzefozosa.pdf
    • https://poxenatus.files.wordpress.com/2020/06/wamuxiwutelafifaz.pdf
    • https://vasezidavub.files.wordpress.com/2020/06/60493174398.pdf
    • https://sewores.files.wordpress.com/2020/07/93666433035.pdf
    • https://cdn.shopify.com/s/files/1/0435/2039/3375/files/jedewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8220/3811/files/25496497898.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/waniwifiribuxakowuzajupol.pdf
    • https://cdn.shopify.com/s/files/1/0433/4334/7877/files/dogopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5571/8298/files/9814256436.pdf
    • https://cdn.shopify.com/s/files/1/0435/8556/8923/files/61823838648.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/71359560508.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9643/files/68156993537.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_off0000c830.bin
65a991b4de3745d0eb2bca5e9c85e6b33b51b54d2ebdda09e1f8c6a36c33307b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC830 4628 bytes
font_01_sfnt_off0000d7e9.bin
5f08c365a32d1d2523851ebe5c44357a28084ffb2c4d4d95b6f893147f04546b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E9 16404 bytes

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