Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0ab1837f751df1…

MALICIOUS

PDF

45.7 KB Created: 2020-08-25 22:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9f289f8cf6bd5dcd4c3b9337963c2c0 SHA-1: ca8265bcb6218f86c38077bb1d073abae5d91014 SHA-256: ad0ab1837f751df16327fe022080148a4b1f2d5d5f431639e123291b6685b82e
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains the text 'Actualizar foto viewer', suggesting a lure for users to update their photo viewer. The presence of a large number of external PDF links, as indicated by 'PDF_SEO_LINK_FARM', further supports a malicious intent, likely for SEO poisoning or distributing further malicious content. The ML classifier also strongly flagged this PDF as malicious.

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=actualizar+foto+viewer
    • http://files.simplysweetsbylauren.com/uploads/1/3/0/7/130738870/ledinipawumutu-defiru-lenivu-rejigefovoto.pdf
    • http://files.localh.com/uploads/1/3/1/6/131607110/5874063.pdf
    • https://cdn.shopify.com/s/files/1/0433/7080/7459/files/dolatenovizefexanirenoxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/amazing_grace_descant.pdf
    • https://cdn.shopify.com/s/files/1/0462/3145/3847/files/prostate_cancer_information.pdf
    • https://cdn.shopify.com/s/files/1/0440/4504/1814/files/63537612616.pdf
    • https://cdn.shopify.com/s/files/1/0434/6557/2514/files/good_night_gif_images_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/67804624884.pdf
    • https://cdn.shopify.com/s/files/1/0433/7650/9080/files/programa_aprendizajes_clave_educacion_fisica.pdf
    • https://cdn.shopify.com/s/files/1/0433/6071/4904/files/90984032347.pdf
    • https://cdn.shopify.com/s/files/1/0435/2652/0986/files/xorusizowave.pdf
    • https://cdn.shopify.com/s/files/1/0463/3709/7889/files/chinedu_nwadike_free_music.pdf
    • https://cdn.shopify.com/s/files/1/0463/0786/8834/files/veni_creator_spiritus_chant_sheet_music.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_off0000663e.bin
30734f462fcd078a328adfde35df40d3f2ae92b5407034e6e12fd5edf893646d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663E 4664 bytes
font_01_sfnt_off00007648.bin
26c779339178df94467d4ffa2123affaccbb46a854fc28754aa0b472d50899a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7648 11112 bytes
font_02_sfnt_off00009a94.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A94 4324 bytes

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