Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc027cddb1efeb9…

MALICIOUS

PDF

40.9 KB Created: 2020-08-09 03:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c023cb53a6ff5388e7732c2f9e2e9f SHA-1: df113aadfcdc51475f870df065b0f22874e57264 SHA-256: 4cc027cddb1efeb9c884c13e6e18af1acd27baf3d53fe11489129924ea6dfca2
152 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a machine learning classifier and contains numerous embedded links. A critical heuristic identified links pointing to a known malicious redirector service, ttraff.ru, which is likely used to obscure the final destination or for SEO poisoning. The document body, though heavily obfuscated, contains references to the redirector URL and several Shopify-hosted PDF files, suggesting a link farm or content distribution strategy. The presence of a malicious redirector and a large number of external links indicates a probable phishing or malicious redirection attempt.

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.ru/pify?keyword=ahmednagar+fort+information+in+marathi+pdf
    • http://viluza.boothandrichlandboutique.com/uploads/1/3/2/8/132814930/6154790.pdf
    • http://files.songyingfang.com/uploads/1/3/0/8/130874495/ad03c08f9d67.pdf
    • http://files.relationalintegration.org/uploads/1/3/2/7/132740541/jawit_detaz_joxenuvijola.pdf
    • https://cdn.shopify.com/s/files/1/0434/6209/9097/files/44298987276.pdf
    • https://cdn.shopify.com/s/files/1/0454/3532/2526/files/abaqus_analysis_user_s_manual_6._14_vol_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/6707/0877/files/electrogravimetry_and_coulometry.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mefopevepal.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/54733610045.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8093/files/neverwinter_nights_weapons.pdf
    • https://cdn.shopify.com/s/files/1/0435/5624/1557/files/14123630457.pdf
    • https://cdn.shopify.com/s/files/1/0432/0201/9487/files/81340973192.pdf
    • https://cdn.shopify.com/s/files/1/0431/3418/9734/files/zutuwozir.pdf
    • https://cdn.shopify.com/s/files/1/0440/1345/3470/files/marriott_s_practical_electrocardiography_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/5653373397.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_off00006374.bin
da2ac36b614d76fbfc96a82cc74bd6d99bdfcf702ac80a583ed8a2904b33e220		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6374 5236 bytes
font_01_sfnt_off00007518.bin
3c661d568361e73c5365bd4a947fb79fc5ef07013f633434c79971e43d37416d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7518 9808 bytes

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