Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a88aff774e71966…

MALICIOUS

PDF

42.5 KB Created: 2020-11-01 21:50:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 57b63d4cbce5f59b2971b56f1ce440a2 SHA-1: b8a8e47e06d00847d2be4b08b7124ce89e8748c9 SHA-256: 7a88aff774e719667b4706de1f0bf90a1b7e9d492f37ee163dc2cf6364679499
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are identified as redirectors to malicious infrastructure. The document body text, though partially obfuscated, includes a URL that points to a known malicious redirector. The presence of a large number of links suggests an attempt to distribute malware or conduct phishing by directing users to potentially harmful sites.

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://ggtraff.ru/aws?keyword=spectrum+optical+florida In PDF document text
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/a47423723fe5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387571/normal_5f9bccf87e324.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/saguwafofix_pogafaxu.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/d80e3c178e75.pdfIn PDF document text
    • https://zifidobu.weebly.com/uploads/1/3/4/3/134371145/xekadituna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366645/normal_5f9ca35713397.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/rizezobabub/jopebumenemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/3956/1145/files/bobby_hill_thats_my_purse_meme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/1796/5215/files/sixofunur.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/xilaber.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/8968/8255/files/97142427594.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/9076/4463/files/worksheet_for_kindergarten_counting.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0491/8309/6998/files/visegimuraboripadusimip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7299/5996/files/56819880280.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/koala_bear_vs_panda_bear.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_off0000598c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x598C 5004 bytes
SHA-256: 7a86f4d18f3e4d3f3399ab261709c3fca7715d49284757b1af4d580207d7ed10
font_01_sfnt_off00006a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A92 10680 bytes
SHA-256: e915b7461bbdef6fbb4ee62e16522f8e45d8b149d284c35c1669a384130a0fef
font_02_sfnt_off00008efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EFC 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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