Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e41eaf735b22ee…

MALICIOUS

PDF

42.5 KB Created: 2020-08-25 20:09:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e8792b93e3dfd2b2581bb489976862d SHA-1: b3c6184253425eef1f25f7c82cc57917da6baf4d SHA-256: c6e41eaf735b22ee3c6db746d69ab385ac9a3048a90898fe7f8605dedca26a82
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=inocencia+interrumpida+pelicula+completa+en+espa%2525C3%2525B1ol'. The document body, though partially corrupted, also contains this URL, suggesting a lure to a malicious site. The presence of numerous other PDF links, some benign and some unknown, indicates a link farm or SEO poisoning attempt to distribute malicious 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.ru/pify?keyword=inocencia+interrumpida+pelicula+completa+en+espa%2525C3%2525B1ol
    • http://jogukul.rumasdeli.com/uploads/1/3/0/7/130775318/3395434.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/78676119198.pdf
    • https://cdn.shopify.com/s/files/1/0431/7390/4545/files/41881591267.pdf
    • https://cdn.shopify.com/s/files/1/0450/2824/5654/files/venezuela_flag_logo_template.pdf
    • https://cdn.shopify.com/s/files/1/0438/3624/4118/files/convert_to_word_using_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4650/files/1263221058.pdf
    • https://cdn.shopify.com/s/files/1/0434/3152/6557/files/fabuwisilu.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/hydro_quebec_power_outage_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/6621/9941/files/oxygen_not_included_power_grid_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/sidadagekuwujezu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2199/7979/files/hearing_loss_definition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0640/2453/files/84581993268.pdf
    • https://cdn.shopify.com/s/files/1/0440/0968/5157/files/webusojedabetofafanon.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/80158809134.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c48.bin
c0494a8d9089f360560a0af6e04a63a224add610c5705d134c123b54fd8a47cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C48 5368 bytes
font_01_sfnt_off00006e15.bin
2b760e4d9c379db4d46ddb6987aece3fd67233d25a0333d28c7f0438d5e1202a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E15 1896 bytes
font_02_sfnt_off0000772c.bin
61099d0ca83a495ebbc2542d222e9b9a15f78dee0f55a37a5ef6c7f60049ccad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x772C 10704 bytes

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