Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8dfc6e9bfcc272…

MALICIOUS

PDF

46.2 KB Created: 2020-08-22 16:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6c00d68f9129cb44e0ba2665e099102 SHA-1: 2427ca360a4ab52d6a0a5f353704e723765b7fa9 SHA-256: 6c8dfc6e9bfcc27289cdb9559a316b98e3eefcd6ec8b6e6ca0462495d22da9f6
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the one identified by the redirector heuristic, suggesting an attempt to lead the user to 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.cc/pify?keyword=edema+serebri+adalah+pdf
    • http://diber.okiobi.com/uploads/1/3/1/1/131164278/1321128.pdf
    • http://files.harrisburghigh.org/uploads/1/3/1/3/131379371/d7ff44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/1679/8886/files/48079257016.pdf
    • https://cdn.shopify.com/s/files/1/0433/0147/0366/files/pathways_2a_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/7273/2836/files/gatebavewetazidoroxaxur.pdf
    • https://cdn.shopify.com/s/files/1/0435/0718/7872/files/tenancy_agreement_form_uk.pdf
    • https://cdn.shopify.com/s/files/1/0459/1462/0053/files/20583149038.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tosinumemelijigejidab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1112/1063/files/cdma_workshop_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0432/8855/9782/files/ashrae_90._1_si.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/dixoj.pdf
    • https://cdn.shopify.com/s/files/1/0433/9331/9079/files/61962439759.pdf
    • https://cdn.shopify.com/s/files/1/0438/9522/6523/files/australian_healthy_eating_guidelines_2017.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068bf.bin
735e39d7212d51195ce3199768e7e0d2d7b8e3acca3ff87f669f50e548a89a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x68BF 4868 bytes
font_01_sfnt_off00007933.bin
b9999a914673fdd8e56749afcd7fbbac1527f624810e5e477ef858a3d24bbeea
pdf-font-stream PDF embedded font (sfnt) at offset 0x7933 11440 bytes
font_02_sfnt_off00009de7.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DE7 4324 bytes