Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db16fb08e35c91e…

MALICIOUS

PDF

90.6 KB Created: 2020-07-31 16:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cedfb854572c3f007171f68a1509ade0 SHA-1: 32fc9cb70b7340fda72d7a3e46eb59cb0f3c0df1 SHA-256: 5db16fb08e35c91e4cc11608c2a90451672132d3f1af5b789d5445972b90e8a8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL, suggesting an attempt to disguise or obfuscate the malicious intent. No scripts were extracted, but the presence of a malicious redirector and link farm indicates a likely phishing or malware distribution attempt.

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=tinkers+construct+fractured
    • http://files.24-7totalfitnesscenters.com/uploads/1/3/1/0/131071231/bec2c11b1cdb6.pdf
    • http://files.vertsdispensary.com/uploads/1/3/0/8/130813146/bunopiwiduwe.pdf
    • http://files.clearriverredangus.com/uploads/1/3/1/4/131453198/2c28d4a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/5693/8664/files/76078424571.pdf
    • https://cdn.shopify.com/s/files/1/0430/8910/0957/files/ritil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9142282406.pdf
    • https://cdn.shopify.com/s/files/1/0431/2150/8509/files/susitajuzinirazoxoxos.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/vabonuwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6083/0116/files/sesozewafizesikafabutemej.pdf
    • https://cdn.shopify.com/s/files/1/0430/0124/9955/files/bajidudajorowig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zobuwavidojanunixi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6990/6844/files/75792824796.pdf
    • https://cdn.shopify.com/s/files/1/0433/0497/6548/files/kejunifudodik.pdf
    • https://cdn.shopify.com/s/files/1/0437/9938/0130/files/numekajigitomegibepi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zutowujovepenatugipo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3470/6083/files/dikajujosenediwepananopib.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e5.bin
c81cac3a46d7c95450c7fb77b2a031abce631ad6c75b4fe8dc7555dd6f8e776e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119E5 4880 bytes
font_01_sfnt_off00012a7e.bin
86a6d252a51f5ed29c9b523a4c747b38a8cabc14849680dcbaa106db936ceb57		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7E 10724 bytes
font_02_sfnt_off00014f19.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14F19 4324 bytes

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