Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ae769fa62e00eb…

MALICIOUS

PDF

67.9 KB Created: 2020-08-13 18:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35cde6c235df01e23814e76a524e9fe5 SHA-1: 79c7adb7c505c802d3d68f75f11b0970d2251b8a SHA-256: 00ae769fa62e00ebe72c9909d2ba42e86974336a44348738326d0e77aa3e3044
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a known malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a PDF related to the economy of Brazil, likely a lure to encourage clicks on the malicious link. 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/wb?keyword=economy%20of%20brazil%20pdf
    • http://files.saravongillern.com/uploads/1/3/0/7/130775980/7615044.pdf
    • http://wuxeken.phenomenologyinvenice.com/uploads/1/3/2/6/132682646/juwopubobopo.pdf
    • http://files.adentausa.com/uploads/1/3/1/8/131871658/dakem-lobove.pdf
    • http://files.totsandco.org/uploads/1/3/0/8/130874066/gesobitodarakog-fetosi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/3856/2712/files/3557926111.pdf
    • https://cdn.shopify.com/s/files/1/0446/9604/3674/files/autocad_3d_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0436/4442/0246/files/20182462022.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/27008444103.pdf
    • https://cdn.shopify.com/s/files/1/0434/3260/7894/files/livopafuramavobamugi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/8368755914.pdf
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/ap_transco_ae_notification_2020.pdf
    • https://cdn.shopify.com/s/files/1/0436/8701/8649/files/93581320185.pdf
    • https://cdn.shopify.com/s/files/1/0431/4464/2715/files/19435024625.pdf
    • https://cdn.shopify.com/s/files/1/0430/3729/4741/files/78142390559.pdf
    • https://cdn.shopify.com/s/files/1/0433/9236/8798/files/14817335384.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/97769695822.pdf
    • https://cdn.shopify.com/s/files/1/0430/5856/1175/files/71853172937.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_off0000c69a.bin
40187e4524b552cb92593d98d8bace9d74ad09772594d01105735bb5ed43765e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC69A 5372 bytes
font_01_sfnt_off0000d8ca.bin
b898940a6913ae856cc06788e87932f5cfc9d82e55f3609ad32698df469d9fe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CA 13160 bytes

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