Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d85bab768483092…

MALICIOUS

PDF

37.4 KB Created: 2020-08-18 20:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd28434ff03802ca2b6d6d1e3e240a30 SHA-1: deacde233343a0a11cd9dcec9e9c4c8417937f10 SHA-256: 0d85bab76848309212b7325b66d100438b95a2a553994bd3941950b45a19da6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known for malicious activity. The document body, though heavily obfuscated, contains text related to a constitution test and includes the malicious URL, suggesting a phishing or redirection attempt. The presence of a link farm heuristic further supports the malicious intent of directing users to external sites.

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=constitution+test+multiple+choice+answers
    • http://files.balancedwellnessdetox.com/uploads/1/3/2/3/132303028/163b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/0775/2861/files/flowers_name_in_kannada.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/46933573519.pdf
    • https://cdn.shopify.com/s/files/1/0428/8898/6787/files/46507077826.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/71211841486.pdf
    • https://cdn.shopify.com/s/files/1/0437/7100/3037/files/93083870846.pdf
    • https://cdn.shopify.com/s/files/1/0430/6586/8437/files/dewamagudogokufamowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/differential_equations_blanchard_solutions_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/sociology_project_topics.pdf
    • https://cdn.shopify.com/s/files/1/0430/3945/7429/files/mazujepuwagexabevo.pdf
    • https://cdn.shopify.com/s/files/1/0434/1750/1852/files/gipizibarevudopilu.pdf
    • https://cdn.shopify.com/s/files/1/0447/8858/0512/files/subtracting_rational_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9206/4933/files/83623563575.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/7024285717.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_off000052e0.bin
0062419e308de7dfb414dfbb497595db132ef58abc6f04a6ed408be0e1a00dc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x52E0 5172 bytes
font_01_sfnt_off00006450.bin
87765fe49f39b7b5527a1690de48572b0648d0b5f8b044021ecdf09bd76a4c9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6450 10768 bytes