Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af3e3e3493296cd…

MALICIOUS

PDF

46.5 KB Created: 2020-08-12 20:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1624c00231de8c0a73e8ba16fd9b9231 SHA-1: 6374c79cb7a735815d00067c7d0f1d50d8c9bd68 SHA-256: 5af3e3e3493296cd4bd9b55ab3adfdcb899c3b521dbcbd348cdcdb0a1d4e476a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with one critical heuristic identifying it as a redirector pointing to malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a large number of external PDF links suggests an attempt to obscure the malicious destination or engage in SEO manipulation for broader reach.

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=worry+tree+worksheet+pdf
    • http://files.clearcreekwatershedcoalition.org/uploads/1/3/2/6/132695568/jomego.pdf
    • http://vumis.hopefulbyhope.ca/uploads/1/3/0/8/130874493/c32b6124.pdf
    • http://files.travelwithbayside.com/uploads/1/3/1/3/131397946/e641141b7.pdf
    • http://files.ibn4u.com/uploads/1/3/1/4/131482953/nitesegemazi-kirunumeset-folilopufiwu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/6163/1384/files/ansys_help_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/calendario_serie_d_girone_d_2020_19.pdf
    • https://cdn.shopify.com/s/files/1/0433/8820/7254/files/bsnl_plans_maharashtra.pdf
    • https://cdn.shopify.com/s/files/1/0428/8849/5270/files/jenopup.pdf
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/7398047874.pdf
    • https://cdn.shopify.com/s/files/1/0437/1379/0106/files/association_rule_learning.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9323/files/zixixamuzuxinare.pdf
    • https://cdn.shopify.com/s/files/1/0432/5274/4356/files/xumotojifabip.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/modumototinolabiroraj.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/33795445314.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2891/files/mijusizafuvi.pdf
    • https://cdn.shopify.com/s/files/1/0445/3256/4132/files/millennium_approaches.pdf
    • https://cdn.shopify.com/s/files/1/0433/0392/7973/files/70213827111.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/nokenozomokufi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076e5.bin
c17a4965d2e071e999266d12a1958d8624b3564aceff1eec6c60c16175a24d10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76E5 5156 bytes
font_01_sfnt_off00008893.bin
a3201212c37c8154b4d8a600cd9bedd9fd1855ed3901f8ba90017cc9f0c78c4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8893 10664 bytes

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