Malicious PDF — malware analysis report

Static analysis result for SHA-256 4316ebc40de234a1…

MALICIOUS

PDF

38.1 KB Created: 2020-08-07 03:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 838d2632bb2e74b008a455930003cc82 SHA-1: ffdb4b6c86884a7b565526a82d1ae2565f17804f SHA-256: 4316ebc40de234a1f15f00053fc841bd874af2daf23c099ea8e81238921d1ff4
120 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to a book title and a URL that appears to be part of a link farm designed to attract search engine traffic. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a keyword suggesting a lure for free book downloads.

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=clinical+hematology+and+fundamentals+of+hemostasis+edition+pdf+free
    • http://files.cookwithjames.com/uploads/1/3/0/7/130739340/8638391.pdf
    • http://files.blackwoodsounddesign.com/uploads/1/3/1/8/131871625/fbbbd890d7.pdf
    • http://files.barkinforapark.org/uploads/1/3/1/8/131856276/puzijozisibajitagowa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23063093424.pdf
    • https://cdn.shopify.com/s/files/1/0430/1763/3949/files/sazemakuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5475/9065/files/sodamaxegonexinidab.pdf
    • https://cdn.shopify.com/s/files/1/0431/4388/9058/files/nugitawugufigonug.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/sajesaxano.pdf
    • https://cdn.shopify.com/s/files/1/0428/8790/5446/files/39017977959.pdf
    • https://cdn.shopify.com/s/files/1/0434/6488/4384/files/xulitivojesepapuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/6869/3411/files/23614508596.pdf
    • https://cdn.shopify.com/s/files/1/0433/8139/1514/files/56074481483.pdf
    • https://cdn.shopify.com/s/files/1/0434/6822/6725/files/nekilulirufamobejiwiro.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/bewifakivoguduxil.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/70009475292.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4456/files/kadaxenoxewebe.pdf
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/17725043743.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_off0000512a.bin
aa2234b239e615dce4b65c5f1a81b231b9b630223f309552dc84a31d6d382aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x512A 5576 bytes
font_01_sfnt_off00006401.bin
7214c9235ee809b3f030feb1a4fc5697db405496388c339f7e9636981ce090e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6401 11132 bytes

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