Malicious PDF — malware analysis report

Static analysis result for SHA-256 43391fb5b481d2a9…

MALICIOUS

PDF

46.6 KB Created: 2020-08-18 19:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70f38173bc2ad445b0897ae03aa90958 SHA-1: d8aea71cb4102b05ec38d5206d164886c6f3eb62 SHA-256: 43391fb5b481d2a942fdbadff17a548e6f11640a1d949896cd228ed8dd704a4a
120 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic identifying it as a PDF link farm and another flagging a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL that triggered the malicious redirector heuristic. The primary intent appears to be SEO manipulation or user redirection to malicious sites, rather than direct exploitation within the PDF itself.

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=training+guide+maplestory+v83
    • http://xotirezu.azitopaving.com/uploads/1/3/2/6/132682555/1503814.pdf
    • http://lakoga.valentinelodge.net/uploads/1/3/0/7/130739423/pelavetopelusovubuz.pdf
    • http://files.hydronicspecialtysupply.com/uploads/1/3/1/4/131438490/6355709.pdf
    • http://fizinu.capitoloperarichmond.com/uploads/1/3/1/4/131437423/3492141.pdf
    • http://files.jessieleethetford.com/uploads/1/3/0/9/130969054/surolikasuxawudufu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1978/files/agua_de_beber_partition.pdf
    • https://cdn.shopify.com/s/files/1/0433/3384/5150/files/guzajedimujitaba.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/puridexerobu.pdf
    • https://cdn.shopify.com/s/files/1/0435/5981/3279/files/flipkart_guess_what_answers_today_2019.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/face_recognition_attendance_system_project.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8456/files/h_s_letter_love_images.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/blind_2014_movie_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/varrock_medium_diary_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/nuwox.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_off000075b4.bin
ff61e7650a99c52ff1b8038a621f81a520930a0be2858d0ae85ef98684ddb2e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75B4 5748 bytes
font_01_sfnt_off00008937.bin
7fc74a1bb8d2531baa9ef49f88fe069f8e6653cb39ab64145d779e4ff9ebb784		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8937 10736 bytes

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