Malicious PDF — malware analysis report

Static analysis result for SHA-256 117cb3502bffe4ee…

MALICIOUS

PDF

42.0 KB Created: 2020-08-22 02:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 45c0f73b0d26ce7895e12b154d29fda7 SHA-1: ff00881fa39cc97041269e19a64cee1f468d1b62 SHA-256: 117cb3502bffe4ee94cb0217c2062aee25eac7213be9f1ffda66ed1e4833399b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains the same malicious URL and several benign-looking Shopify URLs, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=why+does+baking+sheet+warp+in+oven
    • http://zaxijam.brookestreit.com/uploads/1/3/0/7/130739024/vagukixeli_xuxamev_femilewaziniru_gunilimam.pdf
    • http://files.appalachianheirloomplantfarm.com/uploads/1/3/1/1/131164431/e1ea168.pdf
    • http://files.handhinsurance.net/uploads/1/3/1/4/131438539/mefezipopeke.pdf
    • http://files.gitchgear.com/uploads/1/3/1/3/131379591/1a0ba6a6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/weveroxejurufa.pdf
    • https://cdn.shopify.com/s/files/1/0434/0816/2981/files/18258985817.pdf
    • https://cdn.shopify.com/s/files/1/0435/4326/5434/files/32794864554.pdf
    • https://cdn.shopify.com/s/files/1/0431/4166/0826/files/82470173502.pdf
    • https://cdn.shopify.com/s/files/1/0429/2041/1289/files/how_to_find_youtube_url.pdf
    • https://cdn.shopify.com/s/files/1/0433/6818/6024/files/que_es_una_galaxia.pdf
    • https://cdn.shopify.com/s/files/1/0431/5149/1233/files/15455031949.pdf
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/tom_va_za_ry.pdf
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/28484551606.pdf
    • https://cdn.shopify.com/s/files/1/0434/4286/4289/files/sigobo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/wegepene.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/cirrose_em_caes.pdf
    • https://cdn.shopify.com/s/files/1/0428/3400/2086/files/mukumotojamevolev.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006622.bin
84227a9417fa5a3bc07eed410d1d95e206691667da829c45d068e95d3d6ce7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6622 5660 bytes
font_01_sfnt_off00007980.bin
cc3957cf668d97d71396eab7a35036e62571416bbee55c25f2f303d226b79016		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7980 9772 bytes

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