Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c1373cfeefbe8c…

MALICIOUS

PDF

42.8 KB Created: 2020-09-20 03:39:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33c0e497453d3a5c3488e8634cc5195c SHA-1: 7ec33d6680a8207dd3eb22216e3b2c223d245a47 SHA-256: b8c1373cfeefbe8ce7b58874ba2da20444cfce4d7fadd13fd3b472b0c469a7ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a prominent link disguised as a download for 'WWE Immortals hack apk 2018'. This link, along with numerous other embedded links pointing to PDF files, suggests a lure to a malicious redirector or download site. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm designed for SEO poisoning or traffic redirection.

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.me/wix?keyword=wwe+immortals+hack+apk+2018
    • http://kavezodek.ohwhataluckyfish.com/uploads/1/3/2/6/132681352/7921448.pdf
    • http://vuxokeju.eastpauldingyouthfootball.com/uploads/1/3/0/8/130874575/6e8733e206103.pdf
    • http://files.six-tech-victoria.com/uploads/1/3/1/4/131405948/domesasibap.pdf
    • https://cdn.shopify.com/s/files/1/0436/2141/7122/files/examples_of_non_vascular_plants.pdf
    • https://cdn.shopify.com/s/files/1/0431/1243/1776/files/pragmatic_competence_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/2452/2143/files/robo_dwarf_hamster_care_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/3366/4420/files/begezisodetuxinurusibixo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/movimiento_circular_uniforme_y_uniforme_acelerado.pdf
    • https://cdn.shopify.com/s/files/1/0430/9493/3665/files/verb_to_be_simple_present_negative_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/0512/3493/files/38037982200.pdf
    • https://7cd8f393-f990-410a-9002-e34af9a24fe1.filesusr.com/ugd/062c90_5ac6ca7a3ed54ddf9c2ff60ba341be2a.pdf?index=true
    • https://a6dc6a64-5d5e-4c8e-b35c-268f6974dacb.filesusr.com/ugd/23b571_3e601f30728a496aa99ffabdcca315ab.pdf?index=true
    • https://5b66e840-6114-437f-967f-e6657cf5f5d2.filesusr.com/ugd/5438e3_9aec143827bd45fa8d902f718110ff69.pdf?index=true
    • https://20a88856-e6bb-4b2a-98e5-c8423f995081.filesusr.com/ugd/227d0f_f38583d9b247401e836178865d1a8632.pdf?index=true
    • 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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000661c.bin
630a0fe4b365a192ccb85c58536cd3d23eb7480f809343babad66e1186b5687b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x661C 5864 bytes
font_01_sfnt_off00007a03.bin
f185906dcbc612593bfe3c03d08582112394dd176479b300f432faa42b77d5c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A03 10900 bytes

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