Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd93f93f95f4693…

MALICIOUS

PDF

33.9 KB Created: 2020-08-12 00:58:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fd96762331739be38fdd343db154cb6a SHA-1: 92904b91b30ca1298ed390797833d45703ebe9ad SHA-256: 4bd93f93f95f4693bf2153d8440bec04fc7a25f5b7186e7b1c37524cdb6bff6a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=cambridge+igcse+business+studies+fourth+edition+pdf'. Additionally, another critical heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0434/9257/3336/files/46515690371.pdf' being the first URL in this farm. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URLs, reinforcing the 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.cc/pify?keyword=cambridge+igcse+business+studies+fourth+edition+pdf
    • http://files.sweetnelsons.com/uploads/1/3/1/4/131406258/402c292be8f364.pdf
    • http://files.kristenkuiper.com/uploads/1/3/1/3/131379183/likikawevidud-batugofe.pdf
    • http://futudi.robelynmartinezyambao.com/uploads/1/3/0/8/130874524/6488721.pdf
    • http://files.laoshierinmarkle.com/uploads/1/3/1/1/131164386/xivusobol.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/46515690371.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/tres_bien_merci.pdf
    • https://cdn.shopify.com/s/files/1/0434/8251/3561/files/teaching_problem_solving_strategies_in_math.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0438/0049/4241/files/45286022172.pdf
    • https://cdn.shopify.com/s/files/1/0430/7465/0261/files/96067116962.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/sejifekolamavilid.pdf
    • https://cdn.shopify.com/s/files/1/0437/3816/9498/files/alter_ego_plus_4.pdf
    • https://cdn.shopify.com/s/files/1/0437/7287/0807/files/badepaweruzitesudagule.pdf
    • https://cdn.shopify.com/s/files/1/0432/7532/1499/files/37159468686.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zixetirubopejama.pdf
    • https://cdn.shopify.com/s/files/1/0431/2753/7828/files/puzozogomanomemonugeb.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_off000046ee.bin
d5b584b4d9d27a5e9726ce689dd5e376a29864408331fd8473610b6624d3dedc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46EE 5584 bytes
font_01_sfnt_off000059b8.bin
299c4403ad79d3c667016feef070fcc53035117f7dd01acc3352935075caed0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59B8 9584 bytes

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