Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc84cb4eda40b689…

MALICIOUS

PDF

74.3 KB Created: 2020-08-08 15:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17205333ccbb552453dd6d25f37510ed SHA-1: 20652e59b774472832b1b808196d1d6e93641fc7 SHA-256: cc84cb4eda40b689770710c17fa73deb2545350858e4bfc9d4b9a89edade852e
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for being part of a link farm. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure. The primary attack pattern involves redirecting users through a series of links, potentially leading to further malicious content or phishing attempts.

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.cc/pify?keyword=aprendizajes+clave+pdf+primaria+2+grado
    • http://files.christophercarpenter.net/uploads/1/3/1/1/131164556/4f8affb036a84f.pdf
    • http://files.womensmarchfl.org/uploads/1/3/2/6/132695438/1578586.pdf
    • http://files.ashsaverageadventures.com/uploads/1/3/1/6/131606854/kevizozewojitudarop.pdf
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/jogim.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/bebagox.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/xujelenumabeketaxosupu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6345/files/63164090306.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9228/files/96794295207.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/budazasinopuxa.pdf
    • https://cdn.shopify.com/s/files/1/0428/4170/2567/files/84757359941.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/psychology_6th_edition_hockenbury.pdf
    • https://cdn.shopify.com/s/files/1/0434/8978/8070/files/adenoiditis_adalah.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5e6.bin
048fb1891f432488516cd811e7b04d68e7d39e548ca3495625137f8fb0c23ff4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 6744 bytes
font_01_sfnt_off0000d6cb.bin
a18e63de12b65992c777fb52bced49a9f1fe444b002c7303d51ade71a28e466e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 5784 bytes
font_02_sfnt_off0000ea7c.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 2268 bytes
font_03_sfnt_off0000f48c.bin
8281302fe0e7e5f53808852f6eee8453eac34aa7ae9393493bd231ce3dd82e65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 11408 bytes

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