Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de15a67f33d88dd…

MALICIOUS

PDF

49.6 KB Created: 2020-08-12 01:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f355cbb726f1c6b00503db16f9eb312a SHA-1: 1f38944d35a437dbe0ff97dfdd25c9f39dfb2893 SHA-256: 1de15a67f33d88dd9bf11b6864d504ca18ef527654f5e159185d2d109bcdbc4e
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm heuristic, with numerous links to external PDFs, including one hosted on 'cdn.shopify.com'. The ML classifier also strongly indicated maliciousness. The embedded document body text, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=mpdf+vendor+autoload.+php+download', suggesting the document's primary purpose is to lure users to this malicious redirector.

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=mpdf+vendor+autoload.+php+download
    • http://tifidut.picanuge.com/uploads/1/3/1/4/131437919/1284434.pdf
    • http://files.southdublindanceacademy.com/uploads/1/3/1/4/131483275/tulaberosipigi-wejabuga-waxitugekuz-koxobepax.pdf
    • http://files.helenparrish.com/uploads/1/3/1/4/131437983/nepix-tuzewajavor-borobupapalifis-vutuxe.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/john_deere_pressure_washer.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/john_deere_40_loader.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3267/files/73977566716.pdf
    • https://cdn.shopify.com/s/files/1/0437/1975/3879/files/human_anatomy_drawing_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7875/files/gepav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/zamavujaridexavip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6361/files/bukekaxejinaxos.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0136/files/42583032816.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/fast_mouse_clicker.pdf
    • https://cdn.shopify.com/s/files/1/0437/5900/9943/files/los_compas_y_el_diamantito_legendario_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/brge_mietvertrag.pdf
    • https://cdn.shopify.com/s/files/1/0447/9765/7248/files/61762877468.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_off0000675b.bin
c76e0b482175394c339cda7811f83925e52132671840607f7ab07a73010e42ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x675B 4976 bytes
font_01_sfnt_off0000785b.bin
e0e237a73cd6dbc319241a3f2f43abae7be95889ec203ff4486a7533c4fc65ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x785B 16168 bytes
font_02_sfnt_off0000ab03.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB03 4324 bytes

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