Malicious PDF — malware analysis report

Static analysis result for SHA-256 b539c30754be1416…

MALICIOUS

PDF

47.6 KB Created: 2020-09-18 23:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcf8e5c97b0c702ef3955471b6d3865a SHA-1: 877ca0f47ec5b09b329e2e5d7856e43bd7669753 SHA-256: b539c30754be1416b958a78090e0b0e00bb0481fc1679ca33aa8578c96e96ff2
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to redirect users to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, while containing garbled text, includes the string 'Chromosome mutation activity worksheet answers' and embedded URLs that are part of a link farm. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring users through deceptive content to potentially malicious external sites.

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.link/wix?keyword=chromosome+mutation+activity+worksheet+answers
    • http://vibapi.wegrowmicrogreens.com/uploads/1/3/0/7/130776644/nobividod.pdf
    • http://files.austinfamilytreecare.co.uk/uploads/1/3/2/6/132695325/f172b393.pdf
    • http://files.teenwhite.com/uploads/1/3/2/7/132710632/1409622.pdf
    • http://files.jacksonvilleriverrally.org/uploads/1/3/0/8/130813524/mirineliroja_lababo.pdf
    • http://files.smithforepsd.org/uploads/1/3/1/4/131453853/zivisududatun-remirovawokubek.pdf
    • https://cdn.shopify.com/s/files/1/0482/0038/4669/files/constitution_scavenger_hunt_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/2067/1384/files/logituxewonut.pdf
    • https://cdn.shopify.com/s/files/1/0435/2868/3672/files/virtual_russian_keyboard.pdf
    • https://cdn.shopify.com/s/files/1/0432/9255/7467/files/general_meeting_minutes_template_uk.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/31222601861.pdf
    • https://cdn.shopify.com/s/files/1/0441/1251/1128/files/82931950321.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8216/files/zaxutedugewepasosijori.pdf
    • https://cdn.shopify.com/s/files/1/0432/8210/4478/files/big_krit_the_vent.pdf
    • https://cdn.shopify.com/s/files/1/0439/6518/6206/files/life_and_death_twilight_reimagined_vk.pdf
    • https://cdn.shopify.com/s/files/1/0435/7075/7795/files/canara_bank_debit_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.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_off00007b63.bin
f60e1598f94aca12163111e076777504dffff949c0421e9406479fcfcac4a12b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B63 5228 bytes
font_01_sfnt_off00008d13.bin
d587ec84c6bffd8ab041db16da4c37cbd95d8e71ad18a85de11ccb9937b1e880		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D13 10612 bytes

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