Malicious PDF — malware analysis report

Static analysis result for SHA-256 09a87d89ee3ef36d…

MALICIOUS

PDF

44.0 KB Created: 2020-08-24 02:46:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511e3f1e149bbf73c0637acc42ef1ce7 SHA-1: 95d5ec280e67b6587c484eefe389d6a3f05dba08 SHA-256: 09a87d89ee3ef36d57ec5c57a0593cff7d1a416a3447a2067d494279f8cd57d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one that redirects to malicious infrastructure, disguised under the guise of 'brand guidelines'. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent to distribute harmful content. The document body itself is heavily obfuscated and contains the primary malicious URL.

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.cc/pify?keyword=brand+guidelines+que+es
    • http://files.bennettallenwood.com/uploads/1/3/2/7/132711983/gixoli-jigejevolalusuw.pdf
    • http://files.al-shields.com/uploads/1/3/1/4/131407357/riwaralo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7027/5237/files/43894250535.pdf
    • https://cdn.shopify.com/s/files/1/0450/9528/8984/files/football_manager_2016_download_android.pdf
    • https://cdn.shopify.com/s/files/1/0430/6875/2023/files/kivitimalogupavevolag.pdf
    • https://cdn.shopify.com/s/files/1/0432/8164/5736/files/adjectives_describing_physical_appearance.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/putty_256_colors.pdf
    • https://cdn.shopify.com/s/files/1/0433/7831/1318/files/change_opacity_background_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8402/files/1720970891.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/wakolimiwunuzofatixi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0123/4076/files/gokodomoselisimakakowag.pdf
    • https://cdn.shopify.com/s/files/1/0428/8295/7478/files/libro_de_periodoncia_carranza_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0233/9232/files/dental_trauma_guide_luxation.pdf
    • https://cdn.shopify.com/s/files/1/0432/3521/3479/files/79575600080.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061df.bin
384798db065ae168d527493575f34cb140864b2641bbea1aa0bb54a935c50aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61DF 4860 bytes
font_01_sfnt_off00007255.bin
08115f491053a83eb94c53446473847042f5110b063aaf9edd85d68c620ddd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7255 10332 bytes
font_02_sfnt_off0000956b.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x956B 4324 bytes

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