Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a31f83638f44754…

MALICIOUS

PDF

43.1 KB Created: 2020-08-22 19:07:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc2850bde2c24db68b1121281c8865d SHA-1: 60fe97afccc0af9ce1d60c06c34d17a42bb0e916 SHA-256: 0a31f83638f447545dcb462d9025dfb37783a792ec38c9143880bfe2f5bb6879
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm designed to redirect users to malicious infrastructure. The primary malicious URL identified is a redirector that uses a keyword related to transformation stages. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest an attempt to lead users to malicious content, likely for phishing or malware distribution.

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=ectomorph+transformation+stages
    • http://files.johnmendozagarcia.com/uploads/1/3/1/4/131483255/veximip_jetogipofuti_nuxebeva_wokezakerobipis.pdf
    • http://files.annabintadiallo.com/uploads/1/3/0/7/130776645/534b5452.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2139/4343/files/dye_sublimation_shirt_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/4229/2390/files/nowra_cinema_guide.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/59666669299.pdf
    • https://cdn.shopify.com/s/files/1/0436/8711/6965/files/bacterias_gram_positivas_aerobias.pdf
    • https://cdn.shopify.com/s/files/1/0434/0567/2597/files/tajaxetenupiwafufivoxotek.pdf
    • http://files.teaspressa.square.site/uploads/1/3/1/8/131871730/dalupavaginil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7985/1414/files/44118272899.pdf
    • https://cdn.shopify.com/s/files/1/0428/4776/4636/files/jolotitamubasugawekol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2210/6271/files/sobupaxaxonoregumo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0440/3757/0710/files/85832733161.pdf
    • https://cdn.shopify.com/s/files/1/0437/8794/4094/files/vupigigunug.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/visual_cv_templates_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/difference_between_bioavailability_and_bioequivalence.pdf
    • https://cdn.shopify.com/s/files/1/0437/4944/1688/files/character_of_enobarbus_in_antony_and_cleopatra.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_off00006a1e.bin
9497d3991158ef415fd04b5a7bf3437240f55e71b4b7ab70014ec4c5ac9eb758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1E 5352 bytes
font_01_sfnt_off00007c2d.bin
16a15dec61639a881d0faeb907b3b371902785f4e151e511ba3da0692211f5e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2D 10220 bytes

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