Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20f959a8636dd59…

MALICIOUS

PDF

53.1 KB Created: 2020-08-22 02:39:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15705e47b79ad5c4e6a0d1764e8252f1 SHA-1: 5b60762fc5403680145740969099a1adac21cf51 SHA-256: e20f959a8636dd59b8c6bb9d77bfc068a8de6fd3d19a9b13360f97b410cb27d7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

This PDF document contains a malicious redirector link disguised as a worksheet title. The link leads to a farm of other PDF files, likely to obscure the malicious intent and spread the attack. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to known malicious infrastructure.

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.com/pify?keyword=percentage+increase+and+decrease+worksheet+year+9
    • http://files.laurensgreenthumb.com/uploads/1/3/2/6/132680813/wegojoj.pdf
    • http://files.ethanemersonmusic.com/uploads/1/3/1/4/131407135/2346549.pdf
    • http://dupovo.spikemclarrity.com/uploads/1/3/0/7/130738948/muxujerimimenoga.pdf
    • http://files.youniquediamonds.org/uploads/1/3/0/8/130814055/bukuto-saxakan-mebifurof-sanomojekede.pdf
    • http://solupive.seergreensingers.com/uploads/1/3/0/7/130739457/nagaziz.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/wow_hallow_s_end_guide_2019.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/70257783714.pdf
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/files/rafetekabitixuboduxazedow.pdf
    • https://cdn.shopify.com/s/files/1/0438/2742/9533/files/college_physics_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/8573/9685/files/bharathiar_university_syllabus_2020_to_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/70377051957.pdf
    • https://cdn.shopify.com/s/files/1/0438/9978/1288/files/merge_files_into_one_jpg.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/zikovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/libros_de_cagliostro.pdf
    • https://cdn.shopify.com/s/files/1/0434/1583/0695/files/23845228875.pdf
    • https://cdn.shopify.com/s/files/1/0437/0645/0074/files/viladi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7741/8651/files/kovats_retention_index.pdf
    • https://cdn.shopify.com/s/files/1/0428/9026/4742/files/wetukirefinuwofejuloz.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/
    • https://cdn.shopify.com/s/files/1/0438/3460/5728/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000869f.bin
04a53a6ec279f611fb8fef946b46f7dcfcae6451d807e922a935d613cbe8b7fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x869F 5584 bytes
font_01_sfnt_off000099af.bin
192cf83de1e7fbea553c512d2161461a329629aac2ff2d52ad84d9c0c0b97586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AF 14312 bytes

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