Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ab69396b14a0d…

MALICIOUS

PDF

49.4 KB Created: 2020-08-11 03:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef83a3430bee9870e4fd0d053bbfdd3 SHA-1: 262fc51e3b460300c6bab2fc5a3bb6f07e1f8d94 SHA-256: 5a3ab69396b14a0dae7052cf9e7666b1f397b7dad30fd038136af2dd19540232
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDFs, suggesting a link farm or SEO poisoning attempt. One of the primary links directs to a known malicious redirector infrastructure, indicating a malicious intent to lead the user to harmful content. The ML classifier also strongly flagged this PDF as malicious.

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=durability+of+geopolymer+concrete+pdf
    • http://linigarop.ecospiritdesigns.com/uploads/1/3/1/4/131407406/2663183.pdf
    • http://wasoruk.nanoteacher.org/uploads/1/3/0/7/130775422/7416270.pdf
    • http://files.languageexchangecenter.com/uploads/1/3/2/7/132740905/aedd477576d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5943/7975/files/pibojevibeji.pdf
    • https://cdn.shopify.com/s/files/1/0435/7206/8520/files/shoulder_dystocia_management.pdf
    • https://cdn.shopify.com/s/files/1/0429/3351/8489/files/rakuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0213/3656/files/suposawisefefakekaza.pdf
    • https://cdn.shopify.com/s/files/1/0440/8734/5304/files/ohio_air_practice_test_algebra_1.pdf
    • https://cdn.shopify.com/s/files/1/0436/0405/0084/files/54408188508.pdf
    • https://cdn.shopify.com/s/files/1/0428/9023/1974/files/kigutuzofejuvimanupafi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4205/4048/files/amantes_para_sempre.pdf
    • https://cdn.shopify.com/s/files/1/0433/5121/2200/files/73872440128.pdf
    • https://cdn.shopify.com/s/files/1/0430/8267/8433/files/43129839603.pdf
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/xejowavupasarekub.pdf
    • https://cdn.shopify.com/s/files/1/0434/8670/7876/files/97463921412.pdf
    • https://cdn.shopify.com/s/files/1/0433/4462/5822/files/how_to_automate_the_boring_stuff_with_python.pdf
    • https://cdn.shopify.com/s/files/1/0437/3990/6197/files/allotropes_of_sulphur.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c78.bin
15fae28c2b3c5bfece5fd380c36e031c240e61ab3f56d2c814192b41db7034e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C78 5536 bytes
font_01_sfnt_off00008f3e.bin
8be779ebe01e2842f4361aba7fac352a00299f762c9a4e40189ccc87035d485a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3E 13084 bytes

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