Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44c4d6cc2d11467…

MALICIOUS

PDF

47.7 KB Created: 2020-08-05 10:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c68037b9f3268e3ac8733f64d77605a0 SHA-1: 4e5a39581c46c234e8f21711d47df32fc95fe0d4 SHA-256: d44c4d6cc2d114670edb50ba47f511ba754c4db54ba6b87fd74665ef7f090d91
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to mimic legitimate document downloads but lead to potentially malicious sites. One critical heuristic firing indicates a direct link to known malicious redirector infrastructure. The document body text, though heavily obfuscated, contains keywords related to the embedded links, suggesting a lure to trick users into clicking through to these 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/wb?keyword=logarithmic%20table%20book%20pdf
    • http://ropuwa.radoslawrogoza.com/uploads/1/3/2/7/132740214/1650044.pdf
    • http://modonizi.onlinehomemyaccsupport706.com/uploads/1/3/0/7/130775997/eb05bb6.pdf
    • http://files.stbasilbasketball.org/uploads/1/3/1/4/131483249/f9327885d.pdf
    • http://files.johikokjohnwagner.com/uploads/1/3/0/7/130739232/3688484.pdf
    • http://files.pinupprincess.co.uk/uploads/1/3/1/4/131438427/2795189.pdf
    • https://cdn.shopify.com/s/files/1/0429/7572/3673/files/username_and_passwords_for_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0433/6317/2502/files/81583330917.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8903/files/57456932313.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3186/files/24309906499.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/66136176393.pdf
    • https://cdn.shopify.com/s/files/1/0428/2214/0070/files/ap_polycet_2020_model_papers.pdf
    • https://cdn.shopify.com/s/files/1/0428/6958/8124/files/22892397609.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/31375287705.pdf
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/90440204509.pdf
    • https://cdn.shopify.com/s/files/1/0437/6225/3978/files/69230309630.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6959/files/50733835383.pdf
    • https://cdn.shopify.com/s/files/1/0432/2502/2621/files/55150116159.pdf
    • https://cdn.shopify.com/s/files/1/0429/9273/0275/files/aneurisma_disecante_de_la_aorta.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066fc.bin
042663745c2c5249ae671cbed8e67b3d7f8529a33e1ae0de088516b84db86560		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66FC 5536 bytes
font_01_sfnt_off000079a1.bin
3957183e8ce92d98792d4d932155d0057f4773d25fcb72ecf8e2056c5eb9c99e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A1 2484 bytes
font_02_sfnt_off00008446.bin
2b036994bb17838c7ac8e1288e9913de5b76fada2cf513439dd8a83bf89092c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8446 14356 bytes

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