Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f29dc40f01473c6…

MALICIOUS

PDF

60.5 KB Created: 2020-11-06 19:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 2c48f08a4aeac4a9ea12b2faf780e959 SHA-1: 1aa42ad4fde758148042ee710a1fe2bc8a33e548 SHA-256: 3f29dc40f01473c68d22674dcebb0a20a45b963deca5057a90a433c1bdcd0c23
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to external PDFs, which is a common tactic for SEO link farms. One of these links directs to a known malicious redirector, traffmen.ru. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users or manipulate search results, potentially leading to further 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://traffmen.ru/aws?keyword=bb+summer+fate In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369329/normal_5f888d0d3f43a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f8c0f8637997.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369343/normal_5f89b6604fb08.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/desenaz/68209095883.pdfIn PDF document text
    • https://wobonil.files.wordpress.com/2020/11/getabepowegezifinatonak.pdfIn PDF document text
    • https://s3.amazonaws.com/wonoti/12596356404.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/belajar_bahasa_korea_pemula.pdfIn PDF document text
    • https://jizobote.files.wordpress.com/2020/11/tsc_adverts_august_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/how_to_put_a_quote_in_an_essay_in_mla_format.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/rujetujebereterelomo.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/zubojigikufolerumiruxixi.pdfIn PDF document text
    • https://zegasaxum.files.wordpress.com/2020/11/gerumiwaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/threshold_guardian_archetype_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/7881263938.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/mass_to_mass_practice_problems_with_answers.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000769e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x769E 5348 bytes
SHA-256: f6364ca829ad52212de024287b2e65582a37f0858a35b1350259818467908a4c
font_01_sfnt_off0000894b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x894B 5072 bytes
SHA-256: 1e5a4a9244f04b8e7776ab9b0eaddb66c88a57e0cd78a510be30fbe817a3e4e4
font_02_sfnt_off00009a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A32 6196 bytes
SHA-256: d2fde59b048daa0a5594020f48f9eeecdc6584041b7f139aa329f241b8f28f1e
font_03_sfnt_off0000a932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA932 11244 bytes
SHA-256: 391157fd94da974526d6b0ffcdd526905bf58d01dac6da2c08e4f96f07305c73
font_04_sfnt_off0000ceae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAE 16192 bytes
SHA-256: 20babf72346688996081d65ae3c3bf33e49df047f976e60ac90fe62d3a1cd69f

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