Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b046efd1e27b48…

MALICIOUS

PDF

53.7 KB Created: 2020-09-04 16:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7752ec86cf75e4be63718f4d931551c SHA-1: 3a9d13eecfcbd3b64a3e1422bb29a4cf49d14981 SHA-256: 52b046efd1e27b4829d497f79e1b5734b5d2f6f7843f57d98da058832ed33b63
152 Risk Score

Malware Insights

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

The PDF contains a high density of embedded links, many pointing to Shopify domains, forming a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.ru/wix?keyword=struts+2+project+free'. The ML classifier strongly indicated maliciousness. The document body contains obfuscated text and the redirector URL, suggesting an attempt to manipulate search engine results or redirect users to malicious 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/wix?keyword=struts+2+project+free
    • https://cdn.shopify.com/s/files/1/0436/0595/0626/files/miramiwanovavu.pdf
    • https://cdn.shopify.com/s/files/1/0453/4681/6155/files/enadu_news_paper_today_ap.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/37745248854.pdf
    • https://cdn.shopify.com/s/files/1/0431/7505/1415/files/elementary_algebra_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/1512/5662/files/ladojeliwerakeveriga.pdf
    • https://static.usrfiles.com/ugd/173616_61f7c124f1ab487f88bcb841cdd8802e.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fc9a486b9604967a546ce3f8cd15726.pdf
    • https://static.usrfiles.com/ugd/07ef24_18efe82f78af40c292d4bd280c624605.pdf
    • https://static.usrfiles.com/ugd/6846fe_1570e8695b1f4e509f280b7cf228c5c7.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/98251406424.pdf
    • https://cdn.shopify.com/s/files/1/0432/0890/0768/files/lenarabiz.pdf
    • https://cdn.shopify.com/s/files/1/0440/9557/0072/files/namidodelije.pdf
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/akbarnama_in_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/2768/5788/files/revista_natura_em_ciclo_4.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5906/files/ct_ghp_file_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007bbe.bin
316a7ba07832e9136388ebb7f44e1ac0109deac6be60f20a819359ca49870fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBE 5076 bytes
font_01_sfnt_off00008d1a.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1A 2268 bytes
font_02_sfnt_off0000972a.bin
0a4d21abc20a0c08b8683c04aad228964ecfe3fd6399ac2e2a477727d19259ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x972A 16256 bytes

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