Malicious PDF — malware analysis report

Static analysis result for SHA-256 a478c238e22d8a77…

MALICIOUS

PDF

47.2 KB Created: 2020-08-05 02:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b22d214f164ab5998ef9ef497ac1ffd SHA-1: 2b5ab699da1017dd902bb70bbeea9297c4e81ba6 SHA-256: a478c238e22d8a77e36441c86b4512cb72f835c4aa22787ec4241a704d92c9b8
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains text related to 'early child development stages pdf' and includes the malicious redirector URL, suggesting a lure to a malicious site. The presence of numerous links hosted on platforms like Shopify indicates a potential SEO poisoning or link farm strategy to distribute 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/pify?keyword=early+child+development+stages+pdf
    • http://files.emmaharry.com/uploads/1/3/1/6/131606121/14ea0e08976f.pdf
    • http://files.stedmundsbx.org/uploads/1/3/1/8/131871907/kadibunatezad.pdf
    • http://tubavo.factorywarrantylist.com/uploads/1/3/1/4/131482976/zuwojilesap-rivufadabup-wemivagaxiko-jejeka.pdf
    • http://ketip.emptinessenergetics.com/uploads/1/3/1/4/131407469/ea5f4.pdf
    • https://cdn.shopify.com/s/files/1/0431/9916/8673/files/bopaxajixakekamokitebum.pdf
    • https://cdn.shopify.com/s/files/1/0438/4168/3618/files/57952346945.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/homebrew_permission_denied.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8550/files/mixojexemon.pdf
    • https://cdn.shopify.com/s/files/1/0429/8620/9439/files/17329255337.pdf
    • https://cdn.shopify.com/s/files/1/0429/7749/3146/files/xonafijirinasilun.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/kizubebubomikavepuvukegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/21353667002.pdf
    • https://cdn.shopify.com/s/files/1/0437/4134/7994/files/77553466236.pdf
    • https://cdn.shopify.com/s/files/1/0430/4447/0945/files/96608614564.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/32894734894.pdf
    • https://cdn.shopify.com/s/files/1/0432/4537/1549/files/momuze.pdf
    • https://cdn.shopify.com/s/files/1/0430/3860/5461/files/81556978758.pdf
    • https://cdn.shopify.com/s/files/1/0434/5682/3453/files/los_numeros_primos_y_compuestos.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_off000078e9.bin
e46d6faf7dc749529303a88b4d3ff6ea98be4ebe9e2ea9bbcd39271ae53a028e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78E9 5688 bytes
font_01_sfnt_off00008c2e.bin
af7f08297d63bd68905cd3868eb5b2b3286de36413ca0e1fe4e2f1bb3dd4693c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2E 10212 bytes

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