Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f6858c1f5786c08…

MALICIOUS

PDF

45.1 KB Created: 2020-08-24 04:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7802c07acbfe6b503b7de28dd2ec9a53 SHA-1: 908fb73ff58422721247a10ff448c32595a13df9 SHA-256: 8f6858c1f5786c0828bd3ff62675c7dca858a28fe454d4c4861ea5e07c5417ce
120 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a technique often used to redirect users to malicious sites. One critical heuristic firing indicates a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=basic+spanish+conversation+questions+and+answers'. Another critical heuristic identifies a PDF link farm, with many links pointing to Shopify domains, likely as a way to obscure the true malicious destinations. The document body itself is heavily obfuscated but contains the primary redirector URL.

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=basic+spanish+conversation+questions+and+answers
    • http://mifutub.thisisitbe4thefire.com/uploads/1/3/1/3/131379578/5497269.pdf
    • http://kigilu.blackbearinnmoreton.co.uk/uploads/1/3/1/4/131454696/1374423.pdf
    • http://luxunaz.novawestsupplies.com/uploads/1/3/1/6/131606490/e7620a675e5c3f.pdf
    • http://files.fairlie.school.nz/uploads/1/3/1/1/131164075/xevog-katabokog-tonosusibaxenom-lalilaweruxunar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0493/4818/files/wupumuxivejitus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90209356055.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0756/files/austin_and_ally_songs_musicpleer.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/vojekomelu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/wuxunojojejofirak.pdf
    • https://cdn.shopify.com/s/files/1/0434/4843/4840/files/ielts_general_training_writing_task_1_answer_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0438/4597/6224/files/24650880977.pdf
    • https://cdn.shopify.com/s/files/1/0434/1625/6677/files/lekufatutelepovune.pdf
    • https://cdn.shopify.com/s/files/1/0434/3198/5309/files/japanese_candlestick_charts_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/4519/1841/files/pikadatumuz.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_off00007170.bin
e88dac291d3391d8619a4c046a56709fb3bfed636c49dc0eb8765e012eb4110d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7170 5456 bytes
font_01_sfnt_off000083fe.bin
eaac8562e86b4a3b6aab4004623ba3a0e3d36bef6659066efb0b311fd8c3ffa6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FE 10288 bytes

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