Malicious PDF — malware analysis report

Static analysis result for SHA-256 517d711dd0fecaef…

MALICIOUS

PDF

44.9 KB Created: 2020-08-13 03:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dcd2380b7cbdc0750dfafffd2f22b052 SHA-1: 02af370666588c9b11b1c9daa2913c0523d9f89b SHA-256: 517d711dd0fecaefe970c95887fbbab24c5ccec39aad6c01acadb1a1242fd52a
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links, 'https://ttraff.com/wb?keyword=errores%20innatos%20del%20metabolismo%20de%20proteinas%20pdf', is identified as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure users to malicious sites. The presence of a large number of external PDF links further supports the attack pattern of a link farm designed for redirection.

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.com/wb?keyword=errores%20innatos%20del%20metabolismo%20de%20proteinas%20pdf
    • http://bobubib.holisticbirthandbeyond.com/uploads/1/3/0/8/130874493/guwajilutefawa-sisap-dumat.pdf
    • http://files.fairhavenkids.com/uploads/1/3/2/3/132302870/fefaz.pdf
    • http://files.slocampnpack.com/uploads/1/3/0/7/130776401/jofagupasob-sajajopaban.pdf
    • http://files.finksdeli.org/uploads/1/3/2/7/132741222/5b0259.pdf
    • https://cdn.shopify.com/s/files/1/0435/4244/6231/files/mabuwixosovuzuvalokitikox.pdf
    • https://cdn.shopify.com/s/files/1/0434/2009/0535/files/bovine_tuberculosis_review.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/heart_rate_variability_in_athletes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://cdn.shopify.com/s/files/1/0430/2831/6313/files/33347024042.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9758/files/albertsons_job_application.pdf
    • https://cdn.shopify.com/s/files/1/0429/6825/2565/files/majuwoporefijemaxana.pdf
    • https://cdn.shopify.com/s/files/1/0431/7747/6253/files/wemafamabubodo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4402/files/xefosemuvufuvodupelodi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/24932227362.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4311/files/risk_game_of_thrones_skirmish_rules.pdf
    • https://cdn.shopify.com/s/files/1/0437/1814/8261/files/presentacion_del_informe_de_auditoria_administrativa.pdf
    • https://cdn.shopify.com/s/files/1/0437/7686/8510/files/80706741426.pdf
    • https://cdn.shopify.com/s/files/1/0433/7732/8286/files/38651903481.pdf
    • https://cdn.shopify.com/s/files/1/0430/8212/1377/files/fujuderefabivesuf.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_off00006e80.bin
d4a402cb4e0c0ab8e324e6dff9f5dce73f407964ed05ac983a3c53a9daba6f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E80 5284 bytes
font_01_sfnt_off0000805b.bin
945512062b77ec19ff7727ca9805e7b461404c89cc92463759feb4a5cc22a999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x805B 11004 bytes

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