Malicious PDF — malware analysis report

Static analysis result for SHA-256 471ca0a5d31a9369…

MALICIOUS

PDF

45.8 KB Created: 2020-08-08 15:39:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26ec0a6f61af93b9907e8d7ebbd31b81 SHA-1: 51e2a4439b4f9913ccfc4ce9a965cc02ebbeb881 SHA-256: 471ca0a5d31a9369bb89afd619bff7fa0642d326cc14bb59129dc536864b16a6
154 Risk Score

Malware Insights

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

The PDF contains numerous links, masquerading as educational material, which is indicative of a link farm or phishing attempt. The primary malicious URL, https://ttraff.ru/pify?keyword=adjective+exercises+with+answers+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to exercises and PDF downloads, reinforcing the lure. The ML classifier strongly supports the malicious verdict.

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=adjective+exercises+with+answers+pdf
    • http://files.lagunabeachkitehouse.com/uploads/1/3/0/7/130740044/2ef465f7468342d.pdf
    • http://files.goodshepherdinoshkosh.com/uploads/1/3/1/4/131454143/vosewudozokulizudep.pdf
    • http://files.honorflightkc.org/uploads/1/3/1/4/131453252/4689429.pdf
    • http://wuvuka.delveintolearning.com/uploads/1/3/0/8/130874317/0f09712.pdf
    • http://dibefi.eatoncd.org/uploads/1/3/1/6/131606289/43787.pdf
    • https://cdn.shopify.com/s/files/1/0433/8332/4822/files/human_biology_sylvia_mader_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/2168/9254/files/pomuwetutupababero.pdf
    • https://cdn.shopify.com/s/files/1/0440/4533/6726/files/49758749738.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/53204768253.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/bldc_motor_driver.pdf
    • https://cdn.shopify.com/s/files/1/0434/1992/6679/files/hemolytic_uremic_syndrome.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34993807018.pdf
    • https://cdn.shopify.com/s/files/1/0434/9755/4084/files/reflector_2_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kefemomorevogik.pdf
    • https://cdn.shopify.com/s/files/1/0429/3319/0823/files/center_parcs_woburn_activities.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2696/files/vunupobuporamafilag.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_off0000647b.bin
a658850d20c9c451d57fd2f2fb744bc7bcc36082ea31e26bff9545e3b70bfaac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5496 bytes
font_01_sfnt_off0000773e.bin
58b4873d33ac9fffaf45ed1a2312b8eb5fadf3b067e77f8cfe9e87095f6a7717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x773E 6068 bytes
font_02_sfnt_off000086ef.bin
e110ad63484a20cfd421967728af734373f72569bcc9a8de8035b28fbd1a31d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86EF 10156 bytes

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