Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc7418f1a058542e…

MALICIOUS

PDF

45.6 KB Created: 2020-08-17 14:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd2ced82483f31dc598045c61b7712e5 SHA-1: 1a5626eacffa307f67e0736066589ef2c044d4c7 SHA-256: cc7418f1a058542e3cec68c1fe6d7e9627599158729bfee5b5e1ce0cee2cf004
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to a redirector service (ttraff.cc) which is flagged as malicious. The document body, though heavily obfuscated, contains text related to 'math worksheets' and the malicious URL, suggesting a lure to trick users into clicking the malicious link. 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.cc/pify?keyword=math+worksheets+converting+percents+to+decimals
    • http://files.paulalster.com/uploads/1/3/1/0/131069934/vamifiworiri_setukul_sazatikirutaput_pububivifa.pdf
    • http://wovom.jeannekipke.com/uploads/1/3/0/8/130874104/4479229.pdf
    • http://turoseke.ramfel.org.uk/uploads/1/3/0/8/130814328/xijesuros_baxibizivaw_goxirifu_lorabuluvovil.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8992/files/46469798958.pdf
    • https://cdn.shopify.com/s/files/1/0435/0178/1156/files/sex_instruction_video.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/pifaraz.pdf
    • https://cdn.shopify.com/s/files/1/0448/7803/7159/files/83829150285.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1792/files/microwave_attenuator.pdf
    • https://cdn.shopify.com/s/files/1/0448/0493/1746/files/acca_f6_notes_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/1185/8855/files/perchloroethylene_msds.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/vizitofavojedejed.pdf
    • https://cdn.shopify.com/s/files/1/0440/4248/5910/files/xufor.pdf
    • https://cdn.shopify.com/s/files/1/0431/2855/3634/files/boost_self_esteem.pdf
    • https://cdn.shopify.com/s/files/1/0429/9046/9283/files/treinamento_desenvolvimento_e_aprendizagem_organizacional.pdf
    • https://cdn.shopify.com/s/files/1/0432/7574/7491/files/pdf_to_word_converter_download_application.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_off00006493.bin
a199b2fcad01ad9632d12865b9441b75fe6f97d5f9d71790b8016650ae79871e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6493 5496 bytes
font_01_sfnt_off00007733.bin
184688fc9a099300babd98b316e82c2859cac7389aa3638cb88e5191a82218aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7733 10472 bytes
font_02_sfnt_off00009af0.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF0 4324 bytes

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