Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ac3cd031cdaa41…

MALICIOUS

PDF

45.5 KB Created: 2020-08-24 16:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de2bf9cdc75f50b651109a34ec2b251e SHA-1: 2d86de0c3a5f1ef4d53c29ecdc5771fcd7ca7c54 SHA-256: d1ac3cd031cdaa418160a7a684e6a070dbab707bfdd5e82b20a5dff04bef7ecc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to domains associated with link farms and redirectors, indicating a malicious intent to distribute further payloads or conduct phishing. The primary malicious link identified is 'https://ttraff.cc/pify?keyword=solubility+rules+worksheet+pdf', which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'solubility rules worksheet pdf', suggesting a lure to entice users to click the malicious links.

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=solubility+rules+worksheet+pdf
    • http://files.rubensmachine.com/uploads/1/3/1/6/131606465/pafijifigikoruriwaju.pdf
    • http://kugurif.marisol-saona.com/uploads/1/3/0/7/130775363/1525425.pdf
    • http://xuvopifa.thehockeyprofessor.org/uploads/1/3/0/8/130874426/lijulamuzo_dakow.pdf
    • http://buted.thevillagecorner.net/uploads/1/3/0/9/130969868/mewukebe_toxuvukopovedex.pdf
    • http://files.nsksstaffers.com/uploads/1/3/1/6/131606563/758bbd.pdf
    • https://cdn.shopify.com/s/files/1/0441/2411/1000/files/ayyappa_swamy_songs_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/susarodogezuditawum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13977314479.pdf
    • https://cdn.shopify.com/s/files/1/0434/2880/6807/files/simple_past_tense_exercises_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/letoviwabijagok.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/lottery_number_generator.pdf
    • https://cdn.shopify.com/s/files/1/0440/1646/8133/files/wupufaditibijapan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006596.bin
2f0c9cde0153d4d6164a4e2cca8f4457dd3db0095f3d5753bf645a16ee13a969
pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 5196 bytes
font_01_sfnt_off00007761.bin
a9e046d72318b50e06a1e762bf8a7a762530fae9768c8f49db4d110ce7eab753
pdf-font-stream PDF embedded font (sfnt) at offset 0x7761 10364 bytes
font_02_sfnt_off00009ae3.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9AE3 4324 bytes