Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d532ec85e3a7548…

MALICIOUS

PDF

76.4 KB Created: 2020-09-16 17:38:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e42daceb03d352de5cd701ee4d7ca2ee SHA-1: 304875f3812b91edf1e0acca93e6b5e8d3e8f76f SHA-256: 3d532ec85e3a7548d1dfb86052738f8199bd7fe81746fcd9bd02eba9fee238e8
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.me/wix?keyword=mathematics+of+curved+mirrors+worksheet+answers'. This URL is presented within the document body, disguised as a worksheet answer key. The ML classifier also strongly indicated maliciousness. The document appears to be a lure to redirect 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.me/wix?keyword=mathematics+of+curved+mirrors+worksheet+answers
    • https://cdn.shopify.com/s/files/1/0429/2172/2015/files/55817331565.pdf
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/84932541380.pdf
    • https://cdn.shopify.com/s/files/1/0431/9775/9652/files/kitchen_inventory_list_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/5e_descent_into_avernus_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6792/3868/files/ethyl_chloroformate_reaction_with_water.pdf
    • https://938288e2-fc56-4fb5-bed7-bc702d028269.filesusr.com/ugd/26481d_b595aba13666487784d627524b616977.pdf?index=true
    • https://96a5c991-cbdd-4c0a-9ac4-ba399eebeab6.filesusr.com/ugd/668a47_fb66f3b0e32d44b69de7b59389b3e291.pdf?index=true
    • https://8b5c1c7b-7209-4bdc-b77a-cc99969f1e63.filesusr.com/ugd/668a47_2363e27078b245ce8bad550d1f92e1c1.pdf?index=true
    • https://26055df2-d2e7-4d13-b17a-2c6b534548bb.filesusr.com/ugd/bcc0e4_7e2ba91adb3e4629b0cdb1c98fe2953d.pdf?index=true
    • https://dd219402-2ff6-403c-ba50-1e98c8dbc26d.filesusr.com/ugd/b1b3ad_1274033ffa79492bab7c012bdde96401.pdf?index=true
    • https://81bce87e-25cd-4d5a-bd03-453c07643af2.filesusr.com/ugd/81d6a4_e9e76e7937bf496f945bf5313e9da795.pdf?index=true
    • https://f492e150-d502-4df4-88ca-3ef2de372262.filesusr.com/ugd/bc4951_c3d22b5c4726415eb188deca8898b70e.pdf?index=true
    • https://7d5dce2e-43bf-463a-96dd-d08a66fee99d.filesusr.com/ugd/64bd79_d5045ec3d2d34dbfaa8edfe694732006.pdf?index=true
    • https://b88110c2-8699-4f2d-991b-31b020a63020.filesusr.com/ugd/b463f2_c5c502bd1bd94f4d97aec3fa37f4af58.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/school_days_hq.pdf
    • https://cdn.shopify.com/s/files/1/0434/8765/8141/files/xulaxudelop.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2b6.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 2828 bytes
font_01_sfnt_off0000ecb1.bin
147a9b97c8c30437d66bded3382983155519419f319f2f281337a9b681bec1c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB1 5448 bytes
font_02_sfnt_off0000ff35.bin
67fa8fc5445c54604e1a94f5cbb637eb7b9dc91252cba4e803a3efec1b09b355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 10148 bytes

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