Malicious PDF — malware analysis report

Static analysis result for SHA-256 a31a5fc3c1980d22…

MALICIOUS

PDF

55.6 KB Created: 2020-10-30 14:23:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 7de57c60e939f75fa67af7bce4be25be SHA-1: 29adedf49ee468cea658c511996fde9ed0076eb5 SHA-256: a31a5fc3c1980d22a1bdfc3bdd89370a236370d90e8893f0a0953e87e2189b90
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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/123?keyword=colored+wine+glasses+crystal In PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5f939b8a80eb1.pdfIn PDF document text
    • https://fulojozizarotuv.weebly.com/uploads/1/3/4/3/134318677/1755594.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/af3d723e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5f8a56f3b3751.pdfIn PDF document text
    • https://fijapirugonobi.weebly.com/uploads/1/3/4/3/134315317/kuvuzejegavu_kixapiziz_ziseri_jusaninokemod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/rapitebobu.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/articulos_cientificos_mexico.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/monroe_doctrine_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/votoxunamoroxa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7527/2855/files/95538976106.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/85732337852.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/7133/9194/files/wolf_among_us_full_season_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/susonanezaj/english_teaching_method.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
    • 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_off00006dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAB 5112 bytes
SHA-256: 7e65ec3206eef4319da06b71144b96329364c1a1e3a88b0a9cddebbc7319ce67
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 2192 bytes
SHA-256: 5c9b4303eec2be7465a70a4bf0bf42d6a7847045252e0db44991ffe89e50fca8
font_02_sfnt_off0000893c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x893C 10140 bytes
SHA-256: 16dd8de6b522f038fbfb3ba8b8568e68f12f8157efbd997ce34a60c2f29b7c20
font_03_sfnt_off0000abe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE9 16616 bytes
SHA-256: f445d771a9fddec3a392e932c8a7a35224482514ba01793daefebe06dc746517
font_04_sfnt_off0000c27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27F 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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