Malicious PDF — malware analysis report

Static analysis result for SHA-256 b621372897844ec8…

MALICIOUS

PDF

43.4 KB Created: 2020-08-14 06:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4cb38893fd74c8cbe929af6a025c3656 SHA-1: 5c1aa3e52a966ef3e2320e77bd884bed0becdf2d SHA-256: b621372897844ec88882798ca3cfac25353b88e262189c5885237dc85762ef6f
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains multiple embedded URLs, with one identified as a malicious redirector. The document body, though heavily obfuscated, appears to contain text related to 'science for grade 2 worksheets' and includes the malicious URL, suggesting a lure to trick users into clicking the link. The presence of a link farm further indicates malicious intent to distribute malicious content.

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/wb?keyword=science%20for%20grade%202%20worksheets
    • http://files.michelsphotos.com/uploads/1/3/0/9/130969819/6647722.pdf
    • http://files.calhighdance.com/uploads/1/3/1/3/131379999/ravazoxubo-wifokoz-mugamefi-zoxot.pdf
    • http://files.beaconbeerco.com/uploads/1/3/1/4/131453124/duvepufat-retefupemefu-dezufa-bowipusiliri.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/76200956919.pdf
    • https://cdn.shopify.com/s/files/1/0428/4032/6300/files/lepelabagelekenivite.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/62864928701.pdf
    • https://cdn.shopify.com/s/files/1/0430/8008/9760/files/muzimevazoba.pdf
    • https://cdn.shopify.com/s/files/1/0429/3492/7513/files/69830314980.pdf
    • https://cdn.shopify.com/s/files/1/0436/4363/3822/files/75119920053.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7689/files/3878066177.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/56666804065.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/night_bot_twitch.pdf
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/skf_bearing_number_identification.pdf
    • https://cdn.shopify.com/s/files/1/0430/8529/9876/files/49245243906.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/dermatitis_atopik_bayi.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_off00006ab0.bin
2241eedffff7029b1617b6e641f3d879c4b6d8ff06d76bd3e4af351988cf666e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AB0 5640 bytes
font_01_sfnt_off00007dea.bin
ce03f47c023ece5b4bbef972b1c53f440a1156bedce2b6972e5cbdab9cf1eeb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEA 10240 bytes

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