Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c17e876e9424ca…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 12:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8d34c8b3a46058a4376f78650a50fc9 SHA-1: c13049eb4c2a9e8e385e7267a2ab24edef998215 SHA-256: 81c17e876e9424ca203f4dd66f94533d6649f20791e751d9f2131b2a295af44c
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, https://ttraff.com/pify?keyword=ethiopia+travel+guide+book, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Ethiopia travel guide book' and references the same malicious URL, suggesting a lure for phishing or malware delivery. 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.com/pify?keyword=ethiopia+travel+guide+book
    • http://files.nitro-networks.net/uploads/1/3/1/1/131163590/1412292.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0450/3358/6838/files/39946854228.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/74609165002.pdf
    • https://cdn.shopify.com/s/files/1/0430/0003/7527/files/27343218572.pdf
    • https://cdn.shopify.com/s/files/1/0434/0324/7781/files/69517396392.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/ano_ang_kultura.pdf
    • https://cdn.shopify.com/s/files/1/0437/2873/2314/files/die_buddenbrooks_buch.pdf
    • https://cdn.shopify.com/s/files/1/0432/9213/1484/files/alagappan_clinical_medicine_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7589/files/complex_numbers_pdf_sakshi_education.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/student_council_application.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_off00005ba4.bin
6c6a23a3d1d53e02c66c9321379b1327d59e9b1fcfa98caf4eff570c45f9e417
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BA4 5040 bytes
font_01_sfnt_off00006cdb.bin
e3e138ff85142e082b5baf2f3e52246eea4eb31853430835f8e6f4401b07f441
pdf-font-stream PDF embedded font (sfnt) at offset 0x6CDB 10252 bytes
font_02_sfnt_off00008ffb.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8FFB 4324 bytes