Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b7aa21e4538d30…

MALICIOUS

PDF

43.9 KB Created: 2020-08-10 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83281013759b64694ddfb15fc9fc8ece SHA-1: f8aa91aa82ee20576f89aa0218364d393f1fb070 SHA-256: 86b7aa21e4538d3018ab0b7a2d71450d13de4538e3faa33430d36fff9b47f5bd
120 Risk Score

Malware Insights

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

The PDF contains a link farm designed to manipulate search engine results, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL, suggesting a lure to a malicious site. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a link to malicious infrastructure.

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.ru/pify?keyword=accounting+101+study+guide+pdf
    • http://files.getitwright.com/uploads/1/3/0/7/130776788/pufim-fafopunatobi.pdf
    • http://files.darkstarent.com/uploads/1/3/0/7/130738914/1209636.pdf
    • http://files.dearfriendfrank.com/uploads/1/3/1/4/131437949/7d5ba2dc5153f.pdf
    • http://kafimis.rabbipauljacobson.com/uploads/1/3/0/7/130776407/jidida.pdf
    • https://cdn.shopify.com/s/files/1/0428/0736/1703/files/40230909084.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/tinkers_construct_2_materials.pdf
    • https://cdn.shopify.com/s/files/1/0429/6844/9180/files/52298812620.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2469/files/29855258191.pdf
    • https://cdn.shopify.com/s/files/1/0432/7417/4624/files/jodi_picoult_handle_with_care.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/labikuma.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/99424231211.pdf
    • https://cdn.shopify.com/s/files/1/0432/6418/0390/files/19582272980.pdf
    • https://cdn.shopify.com/s/files/1/0434/2900/3416/files/20422359951.pdf
    • https://cdn.shopify.com/s/files/1/0430/0272/4506/files/march_book_one_summary.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/california_living_will.pdf
    • https://cdn.shopify.com/s/files/1/0432/7240/5157/files/89810682076.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_off00006de0.bin
053258db0920aabd4929e6033ece4fd4b663363eafb2c0bf7dd84019f5450c07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DE0 5268 bytes
font_01_sfnt_off00008001.bin
b6d2c0a38fbb4d3af5e46670edc28474576ae993379f05f91d53f9a1f3d657f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 10208 bytes

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