Malicious PDF — malware analysis report

Static analysis result for SHA-256 483329db130fffd5…

MALICIOUS

PDF

42.5 KB Created: 2020-08-06 07:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daf24d2357f04f7d71249ca20b17aac7 SHA-1: 762f7441456a0d3621b4f8b830a1200d362182f9 SHA-256: 483329db130fffd529759d63eb203fb6a0ec1e15fe8de82e8039f3b2ae04b4ee
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector at `https://ttraff.com/pify?keyword=conjunction+of+time+worksheet+pdf`. The document body, though heavily obfuscated, appears to contain text related to a worksheet, suggesting a lure to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=conjunction+of+time+worksheet+pdf
    • http://files.bellafurworks.com/uploads/1/3/1/8/131856381/duguvat.pdf
    • http://files.haymakerprints.com/uploads/1/3/0/7/130775257/zidozeg_kesiwibolubod.pdf
    • http://tezosi.wbfi.org/uploads/1/3/0/7/130740596/fobaxofiredazi.pdf
    • http://files.literaryhumboldt.org/uploads/1/3/0/7/130775387/53f1dfe69011.pdf
    • http://wasafezip.patrickandjohn.com/uploads/1/3/2/6/132681946/e1c91.pdf
    • https://cdn.shopify.com/s/files/1/0430/1848/5923/files/82161197176.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9521/files/mongodb_create_index.pdf
    • https://cdn.shopify.com/s/files/1/0432/4560/0931/files/24406527901.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/sivama.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7381/files/32227413.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/86869316535.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8758/files/wevitidefo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/57822844779.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/16642810547.pdf
    • https://cdn.shopify.com/s/files/1/0432/3092/0871/files/malcolm_baldrige_business_excellence_model.pdf
    • https://cdn.shopify.com/s/files/1/0432/3311/6317/files/rusajirixipaludadag.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/bogamagilometamofipuvawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5454/6590/files/30990280281.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_off0000663c.bin
9ad68799722a8336bba24f8e9cc4a4e64584f35162a64559916e6fb8db90a79c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x663C 5292 bytes
font_01_sfnt_off0000782b.bin
d2fbd62d261a2f1c203b7e2bf6da9989cb4f5a836f884a3842239f0f97919ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x782B 10904 bytes

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