Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ec443e1eb709bd…

MALICIOUS

PDF

58.8 KB Created: 2020-08-09 11:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c43b8a885136a85147d98c2d280c138 SHA-1: 1276ac7a10c73a7e7fa9adc199b631ceadabf6d4 SHA-256: 74ec443e1eb709bdb67e8bd768f9aa345f0eb49c56c37f074386912397e27ebb
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru, suggesting a link farm or SEO poisoning attack. The document body, though heavily obfuscated, contains the same keywords as the malicious URL, indicating an attempt to lure users to malicious infrastructure. No scripts were extracted, but the presence of numerous embedded links points towards a phishing or redirection scheme.

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=bsc+biotechnology+books+for+free+in+pdf
    • http://files.futurebanktoday.net/uploads/1/3/2/7/132740281/2664038.pdf
    • http://files.inspirenetworks.net/uploads/1/3/1/4/131452922/4513656.pdf
    • http://files.adamdoesdisney.com/uploads/1/3/1/4/131453917/ruxadaridofofogakup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/wilodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2823/3883/files/hamlin_wv_topix.pdf
    • https://cdn.shopify.com/s/files/1/0434/4646/8769/files/install_npm_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/1816/6167/files/wufegex.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/gewuma.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/wuxakozes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9292/5852/files/60162034201.pdf
    • https://cdn.shopify.com/s/files/1/0447/8933/4177/files/bsc_banking_awareness_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/90060349769.pdf
    • https://cdn.shopify.com/s/files/1/0429/3407/5558/files/fubifugaweb.pdf
    • https://cdn.shopify.com/s/files/1/0432/5618/4992/files/72991996872.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/siyavula_physical_science_grade_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/6640/6550/files/9448245028.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007775.bin
0cbdbdccb53df735c12f3379b0a7b128aa73bf6a4fad8af16a48dffbad3835b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 5564 bytes
font_01_sfnt_off00008a64.bin
35c0a746fcdf55e64f2ba55209f6a139fa5d4ea47dce36c63c78d1e6d66b29b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A64 3204 bytes
font_02_sfnt_off00009755.bin
7c39ce28624f4542f75b1ffc8145173145833d4531dc284b7a223e4ff974262f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9755 2576 bytes
font_03_sfnt_off0000a24b.bin
691108aeccfb5c212e0ff0941c2e59e9b233f5348e7d90d794a2158ebca4f19d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA24B 10792 bytes
font_04_sfnt_off0000c722.bin
bcccb725c9682f8e52dc21f4dbed28cfeb791f33e6a2205b1cf2355c7010a67b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 16260 bytes

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