Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cb52910c84cd0d…

MALICIOUS

PDF

35.7 KB Created: 2020-08-18 22:01:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00d1ae97e4b14d0e80c6a0b40a6dbca6 SHA-1: 891d750a119fa695343fc47b3668a5efbed1ae63 SHA-256: 63cb52910c84cd0d324194e3ac555a9e3c85ff6ce01d32e8cee51303837d6e9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.cc/pify?keyword=cursive+writing+worksheets+small+letters, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to 'cursive writing worksheets' and the malicious URL, indicating a lure to direct users to potentially harmful content. No scripts were extracted, but the presence of numerous links and the identified malicious redirector strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.cc/pify?keyword=cursive+writing+worksheets+small+letters
    • http://jajuvex.lotusbud.co.uk/uploads/1/3/2/6/132682327/bitiwuvadak-lidake.pdf
    • http://files.mccrayaccountingservices.com/uploads/1/3/0/7/130776267/bobosen.pdf
    • http://files.shbshowpigs.com/uploads/1/3/0/8/130874332/mefapumes.pdf
    • http://tikabomo.claybypat.com/uploads/1/3/1/4/131453540/fff60485.pdf
    • http://files.seniorservicesofswfl.com/uploads/1/3/0/7/130775431/1023744.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/5670/9288/files/tezobimapazewin.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/31543944611.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/berobevigaxozede.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17232613021.pdf
    • https://cdn.shopify.com/s/files/1/0436/1161/9491/files/jawowaziwivapotif.pdf
    • https://cdn.shopify.com/s/files/1/0438/4079/8885/files/abamectin_insecticide.pdf
    • https://cdn.shopify.com/s/files/1/0435/8717/4557/files/zunupubababudelikejop.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0328/files/97858303801.pdf
    • https://cdn.shopify.com/s/files/1/0428/9839/1196/files/54300271633.pdf
    • https://cdn.shopify.com/s/files/1/0437/9875/7538/files/83505672.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/minecraft_alpha_texture_pack.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f77.bin
86a17395612cb998109c84733b43cb0a995d82e485269f163ffb2cf4e8d562f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F77 5220 bytes
font_01_sfnt_off0000611f.bin
bdd4348cf4e8caeb4ec2f48cd14c1fb30c43cbc5ed8135fdb8607c27bad0fc9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611F 9448 bytes

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