Malicious PDF — malware analysis report

Static analysis result for SHA-256 498bb146dbc42a3a…

MALICIOUS

PDF

38.4 KB Created: 2020-08-27 12:48:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6f84e30039543b5d835db3ecf265026 SHA-1: 7c9321ad2e0ea9b2c4feb97733302f952d4e169b SHA-256: 498bb146dbc42a3a052ed765cbd71ea1067ff77898bce2397d9eead9e6716e55
154 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, which is also present in the document body. The link leads to a URL that appears to be part of a link farm, likely intended to distribute further malicious content or phishing pages. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the presence of the malicious URL and the link farm heuristic indicates a phishing or 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.ru/pify?keyword=formato+acta+de+reunion+excel
    • http://vebovo.thebeckeffect.com/uploads/1/3/1/4/131453177/fa1a62085.pdf
    • http://files.medicareyourway.com/uploads/1/3/1/1/131164081/3315460.pdf
    • http://vazejota.thinking-drinking.com/uploads/1/3/2/6/132680981/gisawawirinebel.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/darkest_dungeon_android_port.pdf
    • https://cdn.shopify.com/s/files/1/0432/0657/4238/files/40241616230.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/kodevakafew.pdf
    • https://cdn.shopify.com/s/files/1/0437/9515/3058/files/87510037478.pdf
    • https://cdn.shopify.com/s/files/1/0436/3993/1033/files/fetowalixofoxibetiduw.pdf
    • https://cdn.shopify.com/s/files/1/0428/0808/2599/files/transformers_prime_beast_hunters_bumblebee_toy.pdf
    • https://cdn.shopify.com/s/files/1/0440/1987/5998/files/temperamento_sanguneo_colrico_melanclico_fleumtico.pdf
    • https://cdn.shopify.com/s/files/1/0429/5353/9747/files/kexulelunaveku.pdf
    • https://cdn.shopify.com/s/files/1/0430/3503/3757/files/hypertensive_encephalopathy.pdf
    • https://cdn.shopify.com/s/files/1/0430/0954/0257/files/crianza_de_camelidos_sudamericanos.pdf
    • https://cdn.shopify.com/s/files/1/0465/3095/3366/files/mivowuvakezedipifala.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/75465384885.pdf
    • https://cdn.shopify.com/s/files/1/0431/0535/3885/files/nonfiction_book_report_template_middle_school.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/avast_cleanup_cracked_apk.pdf
    • https://cdn.shopify.com/s/files/1/0465/5290/7934/files/bobanur.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_off000058c1.bin
805ca036a34839555e8594e630f9ee177c4a1c6779346b30d2b46bee45394ce6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58C1 4928 bytes
font_01_sfnt_off00006969.bin
5859bdd520dc20dbb9489f975b831eb6263b5d6ae8ff70b6adf9a67db82964f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6969 10444 bytes

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