Malicious PDF — malware analysis report

Static analysis result for SHA-256 720dd1c8efdd1b06…

MALICIOUS

PDF

34.8 KB Created: 2020-08-02 11:45:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d488584ceba73f0c02b9e01f20f6fa31 SHA-1: 869e335446acda1b3bcea6238c13ab85d2cd6547 SHA-256: 720dd1c8efdd1b06b816c1e24e04c21c3199ae437a8b64b2310b7dc26708e346
154 Risk Score

Malware Insights

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

The PDF document contains numerous links, including one pointing to a known malicious redirector. The document body itself contains the malicious URL, suggesting an attempt to trick the user into downloading a file or visiting a malicious site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=sixpackshortcuts+free+download+pdf
    • http://files.iinyouandyouinme.com/uploads/1/3/2/3/132303270/juxafoloka.pdf
    • http://files.balosyachtscorfu.com/uploads/1/3/2/7/132741089/nutulagomo_remavativopunu_lobelukinubas_koroput.pdf
    • http://files.gdbsandiegonepuppyraisers.com/uploads/1/3/0/7/130775808/be5bf13bc30.pdf
    • http://files.pastandpresentmedia.org/uploads/1/3/2/6/132695919/4431023.pdf
    • http://files.cbmcofmadison.org/uploads/1/3/1/4/131437474/35108727.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7306/1532/files/86567128822.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/kepenepemelerugev.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/27360052690.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/23485516689.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bijalikupuxamimidesedol.pdf
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/wagovedixevuremevuzafexis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/mudiximigunelanivox.pdf
    • https://cdn.shopify.com/s/files/1/0428/9147/7148/files/6006786160.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jakenetukuzalavat.pdf
    • https://cdn.shopify.com/s/files/1/0440/9750/3384/files/mijaxulekebiwojemawojix.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/37859499721.pdf
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/52297351153.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34456372212.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_off00004a50.bin
aeebcd566296d98471e68ef1bfcc0311f278c5ad4d9f7915a616bb5dde2d528b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A50 5572 bytes
font_01_sfnt_off00005d56.bin
d66e6674e5376185eb6deb6b5a9ba00015f7c44c1956abf83c987dcb842930c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D56 9636 bytes

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