Malicious PDF — malware analysis report

Static analysis result for SHA-256 8262c884b87e1bde…

MALICIOUS

PDF

47.6 KB Created: 2020-08-11 15:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f851ac523dfbac9b0d074da755e7e24c SHA-1: 4a312f0db4455e653e4a68eff33ce20711b8c62b SHA-256: 8262c884b87e1bde09a5416dd77a340d69314c03a158427dae9cc4632fd6eab8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL and appears to be a lure for educational content. The presence of multiple Shopify-hosted PDFs suggests an attempt to blend in with legitimate content while directing users to malicious infrastructure.

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=soalan%20matematik%20tingkatan%202%20pdf
    • http://wunezakiv.vlmpto.org/uploads/1/3/2/6/132681946/pepilinosam.pdf
    • http://files.pacopioneervalley.org/uploads/1/3/1/4/131407138/velutoraxosi.pdf
    • http://files.jointeffects.net/uploads/1/3/0/7/130775760/nalawufitebu.pdf
    • http://files.twentysomethingissues.com/uploads/1/3/1/4/131437616/846052a586.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/godupujojabowam.pdf
    • https://cdn.shopify.com/s/files/1/0430/2897/1674/files/nerubuxadagojusivujas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/24911442814.pdf
    • https://cdn.shopify.com/s/files/1/0435/2406/3392/files/pdf_xchange_viewer_spell_check.pdf
    • https://cdn.shopify.com/s/files/1/0430/5770/9210/files/book_cafe_business_plan.pdf
    • https://cdn.shopify.com/s/files/1/0432/3239/5426/files/capitec_learnership_2020_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/4827/9957/files/19730196774.pdf
    • https://cdn.shopify.com/s/files/1/0428/6483/6764/files/pexuza.pdf
    • https://cdn.shopify.com/s/files/1/0435/6312/2843/files/18998445907.pdf
    • https://cdn.shopify.com/s/files/1/0434/3247/6838/files/allusion_definition_and_examples.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bofudajix.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/
    • https://cdn.shopify.com/s/files/1/0428/648

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006663.bin
720476d65423997967504a8b5d4c3438b259c812c5586cdcae7b07ce2719f6c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6663 5384 bytes
font_01_sfnt_off000078a7.bin
d99580bcb3f37cc52aa6b1696abdf4b3af5cb54e2188fc8dda02b6e74a4bf1a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A7 10464 bytes
font_02_sfnt_off00009c7c.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7C 16092 bytes

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