Malicious PDF — malware analysis report

Static analysis result for SHA-256 2efc1494a362d1e3…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28bda2ffbd7637e8b530e20186d85f8c SHA-1: cec2d2d387f458e64a5d837d0f18c2849ebe8c91 SHA-256: 2efc1494a362d1e3c8cddbd0cc87d45820377a4b593f7d94af41027c33911d8e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting an attempt to lure users to malicious sites under the guise of academic content.

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=beatriz+colomina+sexuality+and+space+pdf
    • http://files.nauw-southcentralsectional.org/uploads/1/3/1/4/131438282/wuxapi_sadewasobiwa_xafamibozaku_sajadomekekiwe.pdf
    • http://jeporiza.dianastarrrmt.com/uploads/1/3/0/8/130874330/ce30f16e63d089.pdf
    • http://files.disctilldawn.co.uk/uploads/1/3/0/8/130814923/fipegojatulafulu.pdf
    • http://files.goodtimepainting.com/uploads/1/3/1/3/131380337/sumigise_pavevejisazuze_kusele_filokaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45366335679.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/botujama.pdf
    • https://cdn.shopify.com/s/files/1/0432/4402/8068/files/14809848091.pdf
    • https://cdn.shopify.com/s/files/1/0429/9754/7157/files/83479693590.pdf
    • https://cdn.shopify.com/s/files/1/0434/0046/2503/files/98174860832.pdf
    • https://cdn.shopify.com/s/files/1/0428/9842/3967/files/84118311071.pdf
    • https://cdn.shopify.com/s/files/1/0451/0230/1349/files/sword_art_online_alicization_light_novel.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5191/files/gikexobudav.pdf
    • https://cdn.shopify.com/s/files/1/0439/3258/2056/files/78447574820.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/statistics_probability_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0437/7051/1521/files/viwatuxizoki.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7118/files/java_game_of_life.pdf
    • https://cdn.shopify.com/s/files/1/0427/7351/2359/files/jedukoxepelomasin.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_off00006637.bin
500105a7f6b6f67d557469c6713a4ac170e0ea0559d0f1c420eea4e672fef216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 5572 bytes
font_01_sfnt_off00007928.bin
17bfe3c2d7a0c7e68fc89d346089e4599a514be64af82c0bbe8cee629d8ae73f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7928 9968 bytes

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