Malicious PDF — malware analysis report

Static analysis result for SHA-256 114ab280f3788a77…

MALICIOUS

PDF

63.1 KB Created: 2020-08-10 07:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5649b40b8bdbbf6a82d11e8c81e11c9e SHA-1: 144a50ad1571259160acd1535c4aeac4560c8357 SHA-256: 114ab280f3788a77e8447c3821dd54affec6bb0d89d41d19b8952740751c83e4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'chemistry notes pdf' and a URL that appears to be part of a link farm designed to generate traffic. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=o+level+chemistry+5070+notes+pdf
    • http://files.projectufo.org/uploads/1/3/0/7/130739381/4877757.pdf
    • http://files.tompigotpaintings.com/uploads/1/3/1/6/131606011/2975514.pdf
    • http://files.gayedesigns.com/uploads/1/3/1/8/131856723/javoxefu_jenuse_lapekikokebi_vulolugisoxegud.pdf
    • http://vigum.ouwpc.org/uploads/1/3/2/8/132814930/mufiwi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.orgThis
    • https://cdn.shopify.com/s/files/1/0431/9376/1956/files/rendering_in_pen_and_ink.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/18093392243.pdf
    • https://cdn.shopify.com/s/files/1/0435/7970/3451/files/49849228259.pdf
    • https://cdn.shopify.com/s/files/1/0432/1529/0529/files/gubuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/visutujaxetejukusuvu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2873/3352/files/asvab_prep_plus.pdf
    • https://cdn.shopify.com/s/files/1/0437/7113/4106/files/handbook_of_reliability_availability_maintainability_and_safety.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/1317992411.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/92850772433.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2062/files/tusaledesuno.pdf
    • https://cdn.shopify.com/s/files/1/0434/5180/9957/files/5516956864.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
    • http://scripts.sil.org/
    • http://scripts.sil.org/OFLAbyssinica

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fd1.bin
9ebe521dbb9936131a36e9dda6fbfca940d74eab912108584152fc7e2f12952b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FD1 5720 bytes
font_01_sfnt_off00008337.bin
8bf86bd1ff65d52bfbbf71ae7947db104a35a713bc8359bf00128ed5d3eff592		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8337 20800 bytes
font_02_sfnt_off0000a2de.bin
7bec4cd4cb7b12f9fc5f826f9308a459a3b3b0d2778e1579ebccb5d66ccbae78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DE 11288 bytes
font_03_sfnt_off0000cb14.bin
8a3bc2e662f70073891688ed4956f9a1cfc3d63f1f97a9f976650ab0969135d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB14 10588 bytes

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