Malicious PDF — malware analysis report

Static analysis result for SHA-256 143146d75dbdf292…

MALICIOUS

PDF

45.2 KB Created: 2020-10-27 23:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b3055663d1bade0364ed21803a00e4bd SHA-1: 947d0051ca2cad33b3d85f927ee90d8304e38639 SHA-256: 143146d75dbdf2920162a58672cc0eb2c03b1fe480c89437b7d46894dae830ae
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm and a redirector URL, indicating an attempt to lead users to malicious content under the guise of free downloads. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for phishing or malware distribution. The presence of numerous PDF links suggests a link farm SEO tactic to attract victims.

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.club/123?keyword=baby+mario+characters+costumes In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377116/normal_5f8e76d0370aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377414/normal_5f8f334a6028d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_5f938379e40a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5f948aa4d1d02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374364/normal_5f8fe74cd990f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f96d32e5ef4d.pdfIn PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/jixidused.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/kirorafagosox.pdfIn PDF document text
    • https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/wudipikex.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/1/0502/0771/9603/files/whirlpool_steam_clean_oven_instructions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7483/7925/files/73868695554.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4371/7274/files/hearthstone_decks_dragon_mage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4582/7734/files/kajitaxi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1731/2152/files/46197048721.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8575/8618/files/jumotavipolikazofejipibav.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/7662/7863/files/arabic_numbers_1-10.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/8799/6085/files/wugovekazoba.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5951/0425/files/52475498582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/4985/3343/files/join_twos_windows.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4181/7244/files/the_wimpy_kid_movie_diary_the_next_chapter.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68C6 5300 bytes
SHA-256: 1509a18ac0663e965cc656941f07d8f0134796673556ed104e74f73247c285ef
font_01_sfnt_off00007a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A99 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off00008327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8327 10732 bytes
SHA-256: cdd60670b47fd1213eac1bd911137cff58a5c445d0e8fafd2e1cbbcc8df06df2