Malicious PDF — malware analysis report

Static analysis result for SHA-256 0236c19724a08b5a…

MALICIOUS

PDF

46.9 KB Created: 2020-08-31 00:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9cc68ac2693fffd815b95abbb4430f9 SHA-1: bf401bb8fdd1163b263d1b712ad8286eb9bc9331 SHA-256: 0236c19724a08b5aecdfbda3aa558393d92d220cee1b5f94ebc931d7fb6c19d7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking PDF URLs, likely intended to mask the malicious intent.

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/wix?keyword=action+linking+and+helping+verbs+exercises
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/6719/4021/files/woridaselexuxijojavokabo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/bitcoin_mining_android_app_review.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/15267225774.pdf
    • https://cdn.shopify.com/s/files/1/0434/1504/4252/files/pool_cue_tip_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/6646/6202/files/gogarapebasuxonoku.pdf
    • https://cdn.shopify.com/s/files/1/0432/9763/6512/files/fighter_scout_5e.pdf
    • https://cdn.shopify.com/s/files/1/0431/1806/7876/files/bubaxo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3984/1695/files/valkyria_chronicles_report_5.pdf
    • https://cdn.shopify.com/s/files/1/0428/9721/1558/files/82167549268.pdf
    • https://cdn.shopify.com/s/files/1/0434/9935/6324/files/75898539088.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/gekokujo_character_creation.pdf
    • https://cdn.shopify.com/s/files/1/0427/7148/0742/files/toxekigagudobesi.pdf
    • https://cdn.shopify.com/s/files/1/0433/8289/8840/files/lenguaje_musical_melodico_1_ediciones_si_bemol_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/8086/8255/files/86620991152.pdf
    • https://cdn.shopify.com/s/files/1/0451/8828/4565/files/mpsc_sport_game_list.pdf
    • https://cdn.shopify.com/s/files/1/0429/3158/5180/files/50176988791.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ddd.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDD 2828 bytes
font_01_sfnt_off000077d8.bin
a4e1b6b48cf14abe4e7215819ddfc9ca76a4e652c149eeff1ea3b82837c6517e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D8 5656 bytes
font_02_sfnt_off00008afd.bin
4b04a1877d79fa825f0420af40491924690d8cecac213597d57d27436105c775		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AFD 9664 bytes

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