Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d55c160731c30e5…

MALICIOUS

PDF

42.1 KB Created: 2020-08-22 14:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9cc9ae96e71edc65061722c14e25f4d SHA-1: 794f9025099556bc1d1dd20f1851dec369a3556c SHA-256: 4d55c160731c30e52dd253a4253ae01ebd7650ea9e7820fa8cbc2fc32e5dede9
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=best+budget+stock+android+phones+2019'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The document body, though heavily obfuscated, contains the same keyword as the redirector URL, suggesting a lure. The primary intent appears to be redirecting users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=best+budget+stock+android+phones+2019
    • http://files.theclermontvenue.com/uploads/1/3/0/8/130813516/45e546481.pdf
    • http://jofuwum.mrjasonsweeney.com/uploads/1/3/2/3/132302720/wizipu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/45791363220.pdf
    • https://cdn.shopify.com/s/files/1/0430/7818/9205/files/taniwo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3123/1637/files/vemixefavamevabosiweb.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/thanos_vs_hulk_comic.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/basic_korean_language_with_english_translation.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/pibutofejabezuzusatiw.pdf
    • https://cdn.shopify.com/s/files/1/0441/3066/4600/files/wujidujebivuvikife.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9531/files/34274293334.pdf
    • https://cdn.shopify.com/s/files/1/0438/2218/6656/files/ureteral_calculi_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6150/files/97997932487.pdf
    • https://cdn.shopify.com/s/files/1/0434/9893/0341/files/formal_debate_rules_high_school.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_off000063aa.bin
6ef74484a1c253dc6c0ec8de1e22204165e84dbafc496bc460bea6270de838ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63AA 6040 bytes
font_01_sfnt_off00007828.bin
62477c4240c58fa4bdde25162a62f9962b2d9e81d0612f20e43faf3dbbb49b68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7828 10440 bytes

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