Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a071f9f945e0d2…

MALICIOUS

PDF

68.2 KB Created: 2020-11-04 01:53:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e784251bee0906d08086e6dd57a3e096 SHA-1: ef6b68d88f275842bf3d790aae0b0fde0b0ae204 SHA-256: 21a071f9f945e0d2bc4a7c89a601b4e9360458a8d0aac2a192d75fcd52583812
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to "Lithium mines in chile" and the malicious URL. The presence of many external PDF links suggests a link farm or SEO poisoning tactic to drive traffic to malicious sites. No scripts were extracted, but the embedded links are the primary vector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.link/123?keyword=lithium+mines+in+chile In PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/pobulevenen.pdfIn PDF document text
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/lumitimuveni.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/bejenosugede/23732944812.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/oklahoma_dmv_motorcycle_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5204/7272/files/96050598843.pdfIn PDF document text
    • https://s3.amazonaws.com/vesubodufisi/45842804850.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7831/2625/files/51190205997.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/barossa_valley_wine_map.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/gumup.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/burilojigidet.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB879 4672 bytes
SHA-256: 82e39087709ca6afb373b9d3c21d9d38b3a54d8d809133b1e1331b3146cb2c74
font_01_sfnt_off0000c841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC841 11792 bytes
SHA-256: ac0221d4f275a7e1a7469a58f8d2a70a036c58aa84999db1793838810741e0dc
font_02_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 16112 bytes
SHA-256: 95f2fdc14a2f8cdda26bb26952e7a895a0664b32aa7fdea2361ed6ab83a5ffeb

Open this report in the interactive analyzer, or submit your own file for analysis.