Malicious PDF — malware analysis report

Static analysis result for SHA-256 a601ee4e14489d96…

MALICIOUS

PDF

46.3 KB Created: 2020-08-30 10:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08fe9990a0469933e33e3fcc12c2055f SHA-1: 461ad7d8c0e6d9a85ed7caec0b78387be3c09ac5 SHA-256: a601ee4e14489d966bed1f6d57c7de621b9021324d6a4c256cee7f74422f1b72
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=ndlea+app+form.+pdf'. The document body, though heavily obfuscated, appears to contain text related to an 'ndlea app form', suggesting a social engineering lure. The ML classifier also strongly indicated maliciousness.

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/wix?keyword=ndlea+app+form.+pdf
    • https://cdn.shopify.com/s/files/1/0431/5922/4480/files/wagesuzenukekorazefesere.pdf
    • https://cdn.shopify.com/s/files/1/0433/3459/8809/files/catia_assembly_design.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/brian_tracy_no_excuses.pdf
    • https://cdn.shopify.com/s/files/1/0439/2170/3067/files/gidunotefutaf.pdf
    • https://static.usrfiles.com/ugd/e33828_46b472f25b194cffa8822cbc488c1783.pdf
    • https://static.usrfiles.com/ugd/10b11f_d11e540b69b7401ea7736bf08caf2255.pdf
    • https://static.usrfiles.com/ugd/b8c837_7471b1917eb94287b999ede0c3e7c742.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b6d999c51a34c7996ee9ac66540983d.pdf
    • https://static.usrfiles.com/ugd/b8c837_daf4ec05f5bf402faf6d38e30f2777ea.pdf
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/splash_screen_in_android_studio_with_image.pdf
    • https://cdn.shopify.com/s/files/1/0437/0412/3557/files/lifudutuk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4500/3169/files/bescherelle_anglais_les_exercices.pdf
    • https://cdn.shopify.com/s/files/1/0435/0319/0180/files/affidavit_of_single_status_california.pdf
    • https://cdn.shopify.com/s/files/1/0438/2231/7730/files/5._1_certidumbre_riesgo_e_incertidumbre.pdf
    • https://static.usrfiles.com/ugd/b8c837_8d82c79d688e4fb28c8073b1860b3c42.pdf
    • https://static.usrfiles.com/ugd/b8c837_0cdca71efa4d420dae24df829404ce47.pdf
    • https://static.usrfiles.com/ugd/72b0e7_110156fca91d4a24b982f8fff0234e11.pdf
    • https://static.usrfiles.com/ugd/80bfa9_cfe9a9c28b9147aeb161a8ef896e8e11.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000078a4.bin
2ed202e3c07b0620a153c9d7517e18b21fd4cb7e7517e9d310703425afc85360		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A4 5012 bytes
font_01_sfnt_off0000899c.bin
e1070be1ed728dba6a744b66a8667c91c8b77c868398c7d665ddd93ac1d9f80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x899C 10144 bytes

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