Malicious PDF — malware analysis report

Static analysis result for SHA-256 2df31a5533973656…

MALICIOUS

PDF

53.0 KB Created: 2020-11-05 15:36:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: ed5644abc5d0d5d008b8bec89106e5af SHA-1: 96c57747e299d4c6a593ddcc1e1d3874720654af SHA-256: 2df31a55339736569b689eac654fad3fdab73c70ddf73a3eacc8ddc5a37e1683
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a popular book, suggesting a phishing or scam attempt. The PDF_SEO_LINK_FARM heuristic further suggests the document is part of a larger scheme to distribute malicious links.

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://cctraff.ru/aws?keyword=vampire+academy+book+2+online+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f91c2e40cbfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_5f9a7d3c364c9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/3157/8782/files/30537471125.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/gupufoxelaxekazabiri.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/martin_van_buren_elementary_indio.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/sailor_moon_manga_latino.pdfIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/1_goal_free_education_for_all.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/spring_semester_2020_csun_start.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/lloyd_lester.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0502/5631/4521/files/illness_perception_questionnaire_revised.pdfIn PDF document text
    • https://s3.amazonaws.com/tetazino/online_catechism_of_the_catholic_church.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/gerutave.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/algebraic_identities_for_class_9.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/sap_tcode_financial_statement_version.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9015 5528 bytes
SHA-256: 1bd849dad7986b7571c960ef3c2cd9c5a41c4ae80f6450f0e2ad6fa42d36f45c
font_01_sfnt_off0000a2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA2DE 10496 bytes
SHA-256: 797030c22584cbd3f9291187e170afe464fbfd4ae76f5e688069d0cf721143db

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