Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdaa7545ee45c57d…

MALICIOUS

PDF

53.3 KB Created: 2020-07-21 07:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2205291f520b0a62757cf4f2259b16b0 SHA-1: 5979765ba95cff993d8a0cb43471689c51bdab81 SHA-256: fdaa7545ee45c57df5356d7c35ca366496e178744223c035bcb5a09651041d08
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to ttraff.com, a known malicious domain. The document body, though heavily obfuscated, appears to be related to an academic worksheet, suggesting a lure to entice users to click the malicious link. The PDF also hosts a large number of external links, many pointing to Shopify, likely as part of a link farm to improve SEO for malicious content.

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.com/wb?keyword=algebra%202%20conics%20review%20worksheet
    • http://files.ccscrnews.com/uploads/1/3/2/6/132695200/6284fccab.pdf
    • http://files.bryantchoirs.org/uploads/1/3/0/9/130969772/supitevisinefitim.pdf
    • http://files.hemamikkilineni.com/uploads/1/3/1/4/131408572/tuzanimozagasepimaj.pdf
    • http://files.harperperformance.co.uk/uploads/1/3/1/4/131407010/dumufuz-ziduviwadekum-tibifuguxemajot-mabikuda.pdf
    • http://files.wgsrf.com/uploads/1/3/1/4/131453219/5c793b81602ffad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7248/6564/files/koxirek.pdf
    • https://cdn.shopify.com/s/files/1/0435/6187/7663/files/wegob.pdf
    • https://cdn.shopify.com/s/files/1/0432/0326/4667/files/42382728522.pdf
    • https://cdn.shopify.com/s/files/1/0434/3106/7813/files/15746403072.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/reragijod.pdf
    • https://nalurukonulo.files.wordpress.com/2020/07/70202497180.pdf
    • https://wegitasezono.files.wordpress.com/2020/07/76164564628.pdf
    • https://tefejudetuni.files.wordpress.com/2020/07/18304885119.pdf
    • https://rofudenubo.files.wordpress.com/2020/07/61059698158.pdf
    • https://cdn.shopify.com/s/files/1/0427/5660/4070/files/60274471831.pdf
    • https://cdn.shopify.com/s/files/1/0435/0191/2224/files/zepofuj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3321/4621/files/jesojumuwozufajusunus.pdf
    • https://cdn.shopify.com/s/files/1/0430/6560/6301/files/todokotetokanabe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3697/files/2035557717.pdf
    • https://cdn.shopify.com/s/files/1/0432/9019/8180/files/32474789027.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/nupokusovokudo.pdf
    • https://cdn.shopify.com/s/files/1/0432/5166/3012/files/rewasesifezodakixoz.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_off00009132.bin
ce47b7afb7c446902349c214a82923b372fd027d6b6353cc8ca60909bd203fbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9132 5328 bytes
font_01_sfnt_off0000a354.bin
f758f0b649f17c1ff2f31932124317ce3fe32d448c261e547f75c26a6ce1a85d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA354 10704 bytes

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