Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93779b9f4960d2e…

MALICIOUS

PDF

41.2 KB Created: 2020-08-09 17:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faf7ed90ef8ea6c98866bf8fbb6a1081 SHA-1: d7776f35bea77968a24597edb6b80d2ac213d630 SHA-256: f93779b9f4960d2e43afbbcb04ea88a58aa821d97110573d0c863b720f6777d4
152 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to domains associated with link farms and redirectors. The primary malicious link, 'https://ttraff.com/pify?keyword=3rd+conditional+exercises+pdf', is identified as a known malicious redirector. The document body text, though heavily obfuscated, contains the same lure text and URLs, reinforcing the phishing 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.com/pify?keyword=3rd+conditional+exercises+pdf
    • http://files.oneswaggent.com/uploads/1/3/1/4/131406717/8702723.pdf
    • http://wobub.ezrabenus.com/uploads/1/3/1/3/131398560/wujizowatakif-dogarimapaguxe-tifikeruz-lizunul.pdf
    • http://lixutigo.thehempforce.com/uploads/1/3/1/1/131164250/6176934.pdf
    • http://files.carlfismer.com/uploads/1/3/2/3/132302716/sulawopawopavokiv.pdf
    • http://files.robertssurf.com/uploads/1/3/0/7/130775265/6740287.pdf
    • https://cdn.shopify.com/s/files/1/0438/3955/3696/files/30094944167.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/gokewerivefim.pdf
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/mabuxatamomamikatevunoze.pdf
    • https://cdn.shopify.com/s/files/1/0437/8850/1143/files/3739025945.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ralaguguzovepusumizus.pdf
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/normalizacion_de_base_de_datos_ejemplos_resueltos.pdf
    • https://cdn.shopify.com/s/files/1/0427/9461/4940/files/valid_us_address.pdf
    • https://cdn.shopify.com/s/files/1/0431/2029/6090/files/55416377781.pdf
    • https://cdn.shopify.com/s/files/1/0432/6644/1376/files/duzuwe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1713/4499/files/asteroids_in_astrology.pdf
    • https://cdn.shopify.com/s/files/1/0432/2505/5387/files/59516593184.pdf
    • https://cdn.shopify.com/s/files/1/0434/6649/0006/files/95702572350.pdf
    • https://cdn.shopify.com/s/files/1/0440/0765/3526/files/time_complexity_of_algorithms_in_data_structure.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_off000061e2.bin
2680436c0452995b5fc22311151ffd09b6bd31a3b7d094e8a3b35ff8aa4d7419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E2 5284 bytes
font_01_sfnt_off000073ec.bin
dbc5b955b2c595f086dcb9c24f27b70a55f6271f1454d6c134e0e74fafafea68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73EC 10364 bytes

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