Malicious PDF — malware analysis report

Static analysis result for SHA-256 c849420f0a514415…

MALICIOUS

PDF

43.5 KB Created: 2020-08-25 08:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1f1e3a52f13e5a7e3826486d3e204a4 SHA-1: 28b50a2a51771abc6a33be8078351c0e22fea870 SHA-256: c849420f0a514415a8a5e97b4d352df1fbffc84b552007e9988e8576be2db34c
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the same as the one identified by the heuristic. The presence of a large number of external PDF links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

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=burraco+on+line+per+tablet+android
    • http://guwuwipo.thegauge.us/uploads/1/3/0/7/130775388/e7e5666942.pdf
    • http://files.jexofde.com/uploads/1/3/1/4/131408142/1029021.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/78903115964.pdf
    • https://cdn.shopify.com/s/files/1/0431/7069/3284/files/86267902215.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/10863185980.pdf
    • https://cdn.shopify.com/s/files/1/0438/2910/0701/files/zinetefes.pdf
    • https://cdn.shopify.com/s/files/1/0437/7228/0981/files/rofexub.pdf
    • https://cdn.shopify.com/s/files/1/0435/5099/8679/files/astrology_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/guia_de_adestramento_para_ces.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/adventures_of_huckleberry_finn_by_mark_twain.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_off00006cd5.bin
955ec6f008dab7d440fb472c51b33cec7b6ac1974956a0deb44a3f554b8a9d05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CD5 5076 bytes
font_01_sfnt_off00007e18.bin
975f7749d415f415961e8df8df3f337db3631237ac5ad275b27287e05beb1f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E18 10364 bytes

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