Malicious PDF — malware analysis report

Static analysis result for SHA-256 5add7ded7df87cd9…

MALICIOUS

PDF

48.4 KB Created: 2020-08-03 20:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 87ac51d6e1d7b674c08e83a817527f69 SHA-1: eb6ab687bef24f9ecc24beefc6d3dd5dbec56872 SHA-256: 5add7ded7df87cd9cebfba38bd4b1c7cf4088a10e44b920b62532d6a3e06a11f
202 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ru/pify?keyword=biomaterials+book+pdf+free+download In PDF document text
    • http://files.els-landscaping.com/uploads/1/3/2/3/132302894/718897.pdfIn PDF document text
    • http://files.franklywines.com/uploads/1/3/0/7/130775758/1348085.pdfIn PDF document text
    • http://files.playingwithpallets.com/uploads/1/3/2/6/132681516/8418588.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/1/0433/1044/8795/files/arduino_water_level_sensor.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/35532522783.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/fokivumepadaxipado.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6828/4319/files/2977884423.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/tawinunokapidedeb.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2452/1128/files/wukibakuvesoge.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/82822803122.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0428/1511/files/28582199623.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/jesavorufenapuvefumerakak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/lilasunonafadoxenasuvosu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8898/6783/files/86408148971.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2030/4034/files/luzodoludesesipefisufit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/5244022763.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8461/1737/files/41626105760.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_off00007f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F54 5532 bytes
SHA-256: fee9e87381c71ba3430254f184511e05a1eca098ffa984455c0ddde1ea45b5a6
font_01_sfnt_off0000921b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921B 10124 bytes
SHA-256: e3ae9322e0ae022ea767c7d0ae6cf3a1c66cfb9b11821e73f8b20f32d1e0fc48

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