Malicious PDF — malware analysis report

Static analysis result for SHA-256 5450338d2704680c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-09 11:34:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b2b600477ea66b23f903bdff442683e SHA-1: 7df069d3042d40b3ad3c9c489f1d436582279568 SHA-256: 5450338d2704680ccae2f03b2dcf4c3c11b47caf3f8df01e8dce0c9814100bc1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.ru/pify?keyword=arpeggio+guitar+tabs+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=arpeggio+guitar+tabs+pdf
    • http://bitem.sherpublishing.com/uploads/1/3/1/8/131857419/jobabazoj-rotokamawavanov.pdf
    • http://files.5talentstraining.com/uploads/1/3/1/1/131164236/2252437.pdf
    • http://jatukaze.mariachiherenciademexico.com/uploads/1/3/2/7/132710797/xozunufitel-tuzurarozi-zopadi.pdf
    • http://files.howplannedgivingworks.com/uploads/1/3/0/7/130775282/savedefupopebi_pinitisipi_masebatago_xuzuvop.pdf
    • https://cdn.shopify.com/s/files/1/0434/8238/2502/files/tuvupakadinifufarisizon.pdf
    • https://cdn.shopify.com/s/files/1/0430/8549/6482/files/mamozuxodumuxopodokeko.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/deguratenagujufabivofud.pdf
    • https://cdn.shopify.com/s/files/1/0434/0508/2776/files/5250929891.pdf
    • https://cdn.shopify.com/s/files/1/0433/9036/9959/files/basic_air_conditioning_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/2953/6676/files/5660701930.pdf
    • https://cdn.shopify.com/s/files/1/0437/7405/0458/files/gavejas.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4567/files/xoxebopavapojavanigudite.pdf
    • https://cdn.shopify.com/s/files/1/0431/6856/3355/files/49364760231.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/numikonizagamasutesa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3872/7589/files/40833936961.pdf
    • https://cdn.shopify.com/s/files/1/0428/3141/3404/files/99423254466.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_off00005e52.bin
0cbd0729d7d561c9bb3a5db36781eab6c20fbb8702412bfb3b72e5087dcc299b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E52 5308 bytes
font_01_sfnt_off00007069.bin
65acecdd8badb595b1ff49c45d9db5633ac8dc83dc7fa0206e84d1c3c7d8c8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7069 12904 bytes

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