Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fc3551818f80326…

MALICIOUS

PDF

40.1 KB Created: 2020-08-23 11:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e22cfd7c8c5d55d9ce7a652a76387c6f SHA-1: 623967ef7af920919f364d5f220488522a3365b5 SHA-256: 9fc3551818f80326c07069de8c563f71d7a914f77b777c145ff42e2e0f0402d9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=fundamentals+of+computer+graphics+3rd+edition+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. Additionally, the PDF exhibits characteristics of a link farm, with numerous embedded URLs, many of which are hosted on Shopify but also include several unknown domains. The ML classifier strongly flagged this PDF as malicious.

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=fundamentals+of+computer+graphics+3rd+edition+pdf
    • http://files.chodaepjm.com/uploads/1/3/0/7/130739895/zizebegofilosalub.pdf
    • http://xonakug.benglen.org/uploads/1/3/0/7/130776321/numazaz-foregiwikapase-fajovidakavix.pdf
    • http://files.cheddarscbds.com/uploads/1/3/1/4/131482950/5937351.pdf
    • http://files.arrowlocksmiths.net.au/uploads/1/3/1/6/131606123/pisorirujosatavoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/jofupaxobazewubotovofuxa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5970/files/bufevejogiwakedok.pdf
    • https://cdn.shopify.com/s/files/1/0430/7599/3764/files/pesazabujogarajimubixas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/pdf_to_excel_converter_able2extract_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9382/6463/files/52104058896.pdf
    • https://cdn.shopify.com/s/files/1/0437/9135/1969/files/what_is_an_epitaph_example.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/5006/files/96460250348.pdf
    • https://cdn.shopify.com/s/files/1/0431/4352/8609/files/gamejibunexibisa.pdf
    • https://cdn.shopify.com/s/files/1/0431/2871/7463/files/top_engineering_colleges_in_telangana_rank_wise_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6191/1458/files/convert_degrees_minutes_seconds_to_decimal_degrees.pdf
    • https://cdn.shopify.com/s/files/1/0452/1220/5216/files/labaraxazinovivil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/30553092986.pdf
    • https://cdn.shopify.com/s/files/1/0435/8127/6319/files/bhu_b._com_entrance_exam_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/dean_lewis_waves_piano_sheet_music_free.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/
    • https://cdn.shopify.com/s/files/1/0431/0558/3266/files/dean_lewis_waves_piano_sheet_music

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e81.bin
096d1001ebf1d3ebea7ce7ef470367f88afd230e112b4abbd13bb4c9a51a0496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E81 5688 bytes
font_01_sfnt_off000071af.bin
88ddf428fea9c53ec2bcc1bb1d6e76820c4a120264abe08956eee8c1778486ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AF 9752 bytes

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