Malicious PDF — malware analysis report

Static analysis result for SHA-256 45910e1303f184ac…

MALICIOUS

PDF

40.6 KB Created: 2020-08-17 05:46:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1ab3c15b582d3fe1b982dec7755603a SHA-1: fd36db0a4ab05704b4c623ef8794724b69efe275 SHA-256: 45910e1303f184ac869d9d2646377fc0e73c4e76effbe2959d47682c945be144
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, characteristic of a link farm designed to manipulate search engine rankings or distribute malicious content. One of the primary links, 'https://ttraff.ru/pify?keyword=evaluating+algebraic+expressions+worksheet+grade+7+pdf', points to a known malicious redirector. 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.ru/pify?keyword=evaluating+algebraic+expressions+worksheet+grade+7+pdf
    • http://files.lhsperformingarts.com/uploads/1/3/2/3/132303388/319101.pdf
    • http://xedupexu.taylorbarrettphotography.com/uploads/1/3/0/8/130814328/a347128fc.pdf
    • http://files.theblakegroup.net/uploads/1/3/1/8/131857112/e45cf7b56c1301.pdf
    • http://files.red-bean-coffee.com/uploads/1/3/0/8/130814124/3988868.pdf
    • http://jafiduw.carbondalemarket.com/uploads/1/3/1/4/131437254/wanig-kebonomepupu-zovoxitep-zepupijawoxef.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5225/files/tarilatosaraxutuno.pdf
    • https://cdn.shopify.com/s/files/1/0440/7102/6853/files/455204701.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54686169254.pdf
    • https://cdn.shopify.com/s/files/1/0434/6200/0806/files/judirudomosizerowitixalew.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lapifobojupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/hunting_unlimited_2010.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/elite_dangerous_key_bindings.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0903/files/62644307667.pdf
    • https://cdn.shopify.com/s/files/1/0434/2359/6711/files/1587359507.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/33504969900.pdf
    • https://cdn.shopify.com/s/files/1/0427/4959/1718/files/aesculap_neurosurgery_catalogue.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/autocorrelation_matlab_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5591/files/34388141824.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_off00005d83.bin
15c96fc31d69fe5af1221c75f018112b17115785b1973e4fa20e18da7686d8d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D83 5880 bytes
font_01_sfnt_off0000719c.bin
37c319d629e40be9db442cf45748d2b18b340d957fa9f88da0ebed81792f1cf9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719C 10392 bytes

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