Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eaecd80de8deb2…

MALICIOUS

PDF

55.5 KB Created: 2020-08-28 12:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d51d6a7378b4db2dd7b1165f465231 SHA-1: 49f96be98672248ef00d7256da968c060695fe92 SHA-256: 90eaecd80de8deb2fe82dd384cfd7754caf0b2e9c19a227aa26e612c9bba2ac3
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though heavily obfuscated, contains text suggesting it is an exam for primary school students, likely a lure to encourage clicking the malicious link. The presence of a malicious redirector and a large number of external links indicates a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/pify?keyword=examen+de+6+grado+de+primaria
    • http://bugijoj.edtechmmg.com/uploads/1/3/0/8/130814011/jutejasumazukolid.pdf
    • http://nuxuki.jhstoys.com/uploads/1/3/0/9/130969723/pubaso.pdf
    • http://files.katyjunkremoval.com/uploads/1/3/0/7/130740625/2798966.pdf
    • http://files.westmontrotaryclub.org/uploads/1/3/2/7/132740291/98806dbeb6d.pdf
    • https://cdn.shopi
    • https://cdn.shopify.com/s/files/1/0429/4243/1395/files/86658060923.pdf
    • https://cdn.shopify.com/s/files/1/0431/5312/9640/files/wavaguz.pdf
    • https://cdn.shopify.com/s/files/1/0434/5570/9341/files/toligubuzogojime.pdf
    • https://cdn.shopify.com/s/files/1/0433/5081/8969/files/75800562911.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/bowuwewivalefivoliveg.pdf
    • https://cdn.shopify.com/s/files/1/0433/9436/7649/files/8524278625.pdf
    • https://cdn.shopify.com/s/files/1/0434/4492/8674/files/59056032776.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7181/files/d_d_3._5_character_sheet_editable.pdf
    • https://cdn.shopify.com/s/files/1/0434/6504/8214/files/google_pacman_2_player.pdf
    • https://cdn.shopify.com/s/files/1/0461/4068/6489/files/44409286655.pdf
    • https://cdn.shopify.com/s/files/1/0433/8991/1194/files/preeclampsia_guidelines_acog.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_off000096f8.bin
187dabd06f3fb5063a045e17faeabfa644ec5d249ce5f6763bbe24b023ff3e97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F8 5248 bytes
font_01_sfnt_off0000a8bf.bin
3d6e83958a740b5b1280f9401dfb4b0c294fefa039a6eed7d144408d67915d2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8BF 11948 bytes

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