Malicious PDF — malware analysis report

Static analysis result for SHA-256 08f7e6aadcf9f3d6…

MALICIOUS

PDF

32.7 KB Created: 2020-08-18 20:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6104a8db9f696c029236f885c1f9237b SHA-1: 288448a7a17339fb775d823c566e1619e9d9f7dc SHA-256: 08f7e6aadcf9f3d66399545228ff515468cefe548f346becbd722aad75f718ca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for users interested in 'A-level chemistry'. The presence of numerous other PDF links suggests a link farm or SEO manipulation tactic, with the primary malicious URL being the most concerning IOC.

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=a-+level+chemistry+eileen+ramsden+pdf
    • http://files.jsiglobalinc.com/uploads/1/3/1/3/131398605/wejekujox-tetodupuza-xaweti-jizijadeg.pdf
    • http://files.newfypoozoo.net/uploads/1/3/0/7/130775934/vapifijubudigojazi.pdf
    • http://files.annoushkadeightonacupuncture.com/uploads/1/3/1/0/131070851/4372328.pdf
    • http://files.jrpaddon.com/uploads/1/3/1/3/131398472/beae019bab08ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/8794/6133/files/25362561047.pdf
    • https://cdn.shopify.com/s/files/1/0431/0741/8273/files/input_mapper_ps4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1619/9064/files/41530644223.pdf
    • https://cdn.shopify.com/s/files/1/0440/7794/0886/files/augusto_roa_bastos_el_baldio.pdf
    • https://cdn.shopify.com/s/files/1/0427/4916/5734/files/nubugezudakorodap.pdf
    • https://cdn.shopify.com/s/files/1/0432/7112/7206/files/casio_scientific_calculator_fx_991ms_manual.pdf
    • https://cdn.shopify.com/s/files/1/0436/4291/2926/files/banker_s_algorithm_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/dekibawekoxuraluvogewozi.pdf
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/tamil_language_learning_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0430/7727/1706/files/windows_media_player_skins.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000043ed.bin
2d99cb16fed7f295332f9bab32ba93bc073df9a9372524d1d4de41d91bc3792f
pdf-font-stream PDF embedded font (sfnt) at offset 0x43ED 5576 bytes
font_01_sfnt_off000056c9.bin
8a7736cc779b1db55f61ea0d000be67f7ad15381290ccc5d39b7fffd5b5346f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x56C9 9192 bytes