Malicious PDF — malware analysis report

Static analysis result for SHA-256 637ae59f0a79edb7…

MALICIOUS

PDF

71.1 KB Created: 2020-08-07 02:33:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61485054456140e690a25d0f1f0e3531 SHA-1: 2ba32936b2841bfc97a6d81cf450f4eb48bec6c7 SHA-256: 637ae59f0a79edb7038a3bf001aaf4b924a7c09f43efb0475d6bcb6cee4f375c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent link, 'https://ttraff.ru/pify?keyword=99+names+of+allah+with+meanings+in+roman+english+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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.ru/pify?keyword=99+names+of+allah+with+meanings+in+roman+english+pdf
    • http://jajuki.grazeky.com/uploads/1/3/1/4/131482853/16be2464c5c0f21.pdf
    • http://beresowo.samanthaprewettphotography.co.uk/uploads/1/3/1/4/131453598/80a1eeb13eb92f9.pdf
    • http://files.cachor.org/uploads/1/3/0/7/130775174/4517255.pdf
    • http://files.hmcsacadiaalumni.com/uploads/1/3/2/8/132814958/59423f891.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/affidavit_of_domicile.pdf
    • https://cdn.shopify.com/s/files/1/0453/9475/5752/files/best_weight_loss_exercise_program.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/29466938570.pdf
    • https://cdn.shopify.com/s/files/1/0434/4519/0821/files/feluvizuroxixa.pdf
    • https://cdn.shopify.com/s/files/1/0430/8231/7975/files/vexakulus.pdf
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/76412886019.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/ios_8._2_beta_4.pdf
    • https://cdn.shopify.com/s/files/1/0435/1574/0312/files/jodimejujimik.pdf
    • https://cdn.shopify.com/s/files/1/0440/5864/0534/files/69229609299.pdf
    • https://cdn.shopify.com/s/files/1/0436/2688/9378/files/23836291386.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000d647.bin
6ec92961e1b294b9dc8a9d128035322effed6bf9412f4fa27cd59893c30a2eee		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD647 33424 bytes
font_00_sfnt_off0000935c.bin
3d8a23ce54838c8c4972f983efa629ebff4e4543851cbb6c9681f68062d6bcba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x935C 5608 bytes
font_01_sfnt_off0000a658.bin
a453d58b3af1f8e2ec1e74d648fab0a6505cce5a68d4f2a97bd4f4f779f323e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA658 15564 bytes

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