Malicious PDF — malware analysis report

Static analysis result for SHA-256 c575cb0cf111119f…

MALICIOUS

PDF

38.0 KB Created: 2020-08-11 16:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d487d7193ec63be5cadefa27a3020c6d SHA-1: b7ec0b473445bd70133ddfe2a0332569dcbddb81 SHA-256: c575cb0cf111119f35d7f3106d60759a386330cec415f44d7bd843d75e29c5cb
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com, and one critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text related to 'syllabication worksheets grade 5', suggesting a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links indicates an attempt to redirect users to potentially harmful content.

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/wb?keyword=syllabication%20worksheets%20grade%205
    • http://wejibasu.goodkarmabikes.org/uploads/1/3/1/3/131383283/xudofej.pdf
    • http://files.beadsbraidsknots.co.uk/uploads/1/3/0/7/130739826/6451779.pdf
    • http://liranos.iancarlsen.com/uploads/1/3/1/8/131871390/zalomewoliso-guzapit-xezatufelo.pdf
    • http://files.barbarajbecker.com/uploads/1/3/0/8/130813362/5622055.pdf
    • http://files.hendersonbosley.com/uploads/1/3/1/0/131070501/kalavobofisuz.pdf
    • https://cdn.shopify.com/s/files/1/0445/6048/2463/files/literacy_helping_students_construct_meaning.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/82876116519.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/media_query_css_for_all_devices.pdf
    • https://cdn.shopify.com/s/files/1/0429/3092/9827/files/68716733497.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/xiverotezenifefopadag.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/wakijuro.pdf
    • https://cdn.shopify.com/s/files/1/0438/6911/0432/files/aashto_soil_classification_example.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5769/files/46259104687.pdf
    • https://cdn.shopify.com/s/files/1/0430/4479/8613/files/kajowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1184/1958/files/21134783474.pdf
    • https://cdn.shopify.com/s/files/1/0432/7155/3189/files/mind_body_and_spirit_books.pdf
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/61027730667.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_off000054c1.bin
bd0ee8a9f5fcee25c28acaf5f3d764f5329796bcbd95593ff62aebcb8c45d4db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54C1 5824 bytes
font_01_sfnt_off00006893.bin
24328947f9901201aa714ef6de2ba2cdc593dcd7b8e4b5b82cd46572d4091c7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6893 10072 bytes

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