Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b230bdb9c593f4…

MALICIOUS

PDF

57.8 KB Created: 2020-08-09 04:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7bdacd1f5bf0286573c70029678cbf2 SHA-1: 75e7ae96f1d66e7ff1ecef4664161b8c6c16b5a1 SHA-256: 33b230bdb9c593f44d4b478ea7373c11e8d4784eeb3a4e9ccfb877164937f20d
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Ignou bcom syllabus pdf' and the malicious URL 'https://ttraff.com/pify?keyword=ignou+bcom+syllabus+pdf', suggesting a lure to download further malicious content. The presence of a link farm heuristic further supports the malicious intent of distributing links.

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=ignou+bcom+syllabus+pdf
    • http://files.penandnapkin.org/uploads/1/3/1/4/131438397/xegeligixumu_zutuveso_wakolenozawa.pdf
    • http://beras.disneystateofmind.com/uploads/1/3/1/4/131453045/2304258.pdf
    • http://files.labsofdemocracy.org/uploads/1/3/1/4/131407281/9055324.pdf
    • https://cdn.shopify.com/s/files/1/0438/4332/2016/files/55125507602.pdf
    • https://cdn.shopify.com/s/files/1/0427/5427/7532/files/barreras_y_puentes_en_el_proceso_de_la_comunicacion.pdf
    • https://cdn.shopify.com/s/files/1/0430/4053/8773/files/nixuxezujejitizegaxowebej.pdf
    • https://cdn.shopify.com/s/files/1/0431/5509/5712/files/niriwoxamut.pdf
    • https://cdn.shopify.com/s/files/1/0429/1415/2607/files/apostles_creed_anglican.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1271/files/kijudetogexozanokimufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kuwuvovevikusezavufada.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6766/files/sch_access_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/8984/5671/files/strings_mix_simple_java_solution.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/14224520324.pdf
    • https://cdn.shopify.com/s/files/1/0430/0803/2922/files/polimerizacion_por_radicales_libres.pdf
    • https://cdn.shopify.com/s/files/1/0446/8919/5161/files/kirepubigilafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/42043094464.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
stream_006_off0000c80d.bin
057161defc6aa779f6c24aa230de8ee1a314f02452feff0622dcd1f7521771e8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC80D 4804 bytes
font_00_sfnt_off00008ead.bin
545514f5b1d96141ba967255eeb91ea754c79a63804e0614159be6644355cf14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EAD 5556 bytes
font_01_sfnt_off0000a191.bin
138b0ff0135924354962cdc6cbcbab1dd70b2be393c2ea7c730304638d003683		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA191 11712 bytes

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