Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9b2b06996d3e841…

MALICIOUS

PDF

44.6 KB Created: 2020-08-07 02:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e626a6fe09e8929103c7dffeb44f1db6 SHA-1: 0cd6b8749f4b334b90584d6da3769583a4262379 SHA-256: c9b2b06996d3e84179dea56719b45d095916eaf03ef84c32dbada1ba879a1ad0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by multiple critical heuristics for containing malicious redirector links and a large external PDF link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that appears to be part of the link farm, suggesting the primary purpose is to distribute links to other potentially malicious or SEO-abused content.

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/pify?keyword=amharic+bible+81+books+pdf
    • http://kofiv.ulyssesarts.com/uploads/1/3/0/8/130814229/zevare-zisapitakemu-lifaxunexeza.pdf
    • http://files.dewumine.com/uploads/1/3/1/4/131407492/bebujuko.pdf
    • http://files.pathlightwisdom.com/uploads/1/3/1/3/131381612/bufodezexuf.pdf
    • http://files.chirocure.net/uploads/1/3/1/4/131410234/a1b21.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3556/files/aptitude_simple_tricks.pdf
    • https://cdn.shopify.com/s/files/1/0433/9014/0581/files/90779886946.pdf
    • https://cdn.shopify.com/s/files/1/0432/6051/0376/files/aptitude_question_papers_of_infosys.pdf
    • https://cdn.shopify.com/s/files/1/0430/8602/0761/files/13130140443.pdf
    • https://cdn.shopify.com/s/files/1/0428/0057/8723/files/nikuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7722/files/congenital_heart_disease_articles.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9309/files/oxford_bookworms_library_stage_4_the_scarlet_letter.pdf
    • https://cdn.shopify.com/s/files/1/0437/9967/5041/files/tosukowa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zotogobujadafozafinuv.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000054b7.bin
ce6eb75311abb3b40f041e2e554adf0d7c9e3f581eb23fae219ac5af4e1d3524		 pdf-font-stream PDF embedded font (sfnt) at offset 0x54B7 5436 bytes
font_01_sfnt_off00006714.bin
5b2d243175c94293226ae8081ef5ac76da71c59e039deb793623324a5bfd9500		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6714 4376 bytes
font_02_sfnt_off000072f5.bin
fcbb00706bacd48a4de3ef809d776f9ba9745df96e6e7712739183c4544e5056		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F5 10572 bytes
font_03_sfnt_off00009726.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9726 4324 bytes

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