Malicious PDF — malware analysis report

Static analysis result for SHA-256 152c6490486dcf82…

MALICIOUS

PDF

51.4 KB Created: 2020-08-02 16:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20471e58e510e722c7463ac6864a2274 SHA-1: 5d58c5b559b3d57899e051b0200314f095d7ff39 SHA-256: 152c6490486dcf82758c1199a60a5928fbb59a8da1660170246d280c92456372
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to benign Shopify domains, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic designed to lure users to malicious infrastructure. The ML classifier also strongly indicated maliciousness.

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=wizard+dungeon+world
    • http://files.scstagelighters.org/uploads/1/3/1/3/131379709/lepaxefalujomo.pdf
    • http://files.sw-eliteperformancecoaching.com/uploads/1/3/1/6/131606605/03c134123.pdf
    • http://files.unitedbymusic.eu/uploads/1/3/1/4/131454165/pazagupufoj-vozodop-mifes-serivaz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/fadonopawiwew.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/32331237993.pdf
    • https://cdn.shopify.com/s/files/1/0431/8072/0294/files/kagaxuwijufanapixilizupur.pdf
    • https://cdn.shopify.com/s/files/1/0438/4784/4000/files/xukilolekulotovonab.pdf
    • https://cdn.shopify.com/s/files/1/0435/4247/9007/files/zafofunitupomebunaxezi.pdf
    • https://cdn.shopify.com/s/files/1/0433/7873/7302/files/antibiotics_classification_based_on_spectrum_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/3439/5295/files/pizagagolokifafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/27639010215.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/vuwaxebugaxis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2299/2028/files/15611331111.pdf
    • https://cdn.shopify.com/s/files/1/0435/6639/9647/files/lovebak.pdf
    • https://cdn.shopify.com/s/files/1/0430/7035/7653/files/50506194045.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000787c.bin
b1992eaf548e9574a7df493b1c8f2c89175b4395c34cb18d87fa8612bb53f178		 pdf-font-stream PDF embedded font (sfnt) at offset 0x787C 4968 bytes
font_01_sfnt_off0000898f.bin
fd9a14c41ecc74eba064bc6aa285b632b7fafcc8b90bc784bed6941c20f4b21c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x898F 9916 bytes
font_02_sfnt_off0000abb9.bin
d467cea282589720aee9edfcc4f0cf88a0118b06fcae820e6fa800cf49117036		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABB9 16124 bytes

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