Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f0ee2bdf22f65f…

MALICIOUS

PDF

58.2 KB Created: 2020-08-06 04:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddf34094b132928fadf0a9e3431455a2 SHA-1: 0d34a99dd6e2bd9c09c8344b8169e522b64279c4 SHA-256: 74f0ee2bdf22f65f7df6b94c32e56fe75939fdf4f5d2c69377b421bb8af30071
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.cc/pify?keyword=bsphcl+je+electrical+syllabus+pdf. It also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, some of which are hosted on Shopify. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to download a syllabus, which is likely a malicious payload or leads to further compromise.

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.
  • 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.cc/pify?keyword=bsphcl+je+electrical+syllabus+pdf
    • http://files.livinghistorylesson.com/uploads/1/3/1/3/131379828/1263424.pdf
    • http://files.urbanaohio.com/uploads/1/3/1/4/131407492/gesiporuwomunamumina.pdf
    • http://files.lindamkurth.com/uploads/1/3/0/7/130775002/607b9f47972655.pdf
    • http://files.prmueller.co.uk/uploads/1/3/0/7/130739835/kiduzabamarite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/9949/6351/files/94054142355.pdf
    • https://cdn.shopify.com/s/files/1/0428/0126/6851/files/nifivejawupelitokom.pdf
    • https://cdn.shopify.com/s/files/1/0431/9241/8468/files/39968871265.pdf
    • https://cdn.shopify.com/s/files/1/0431/2632/5402/files/6937973544.pdf
    • https://cdn.shopify.com/s/files/1/0432/4022/6984/files/9460858232.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/jefufiwut.pdf
    • https://cdn.shopify.com/s/files/1/0437/4839/3112/files/90094196365.pdf
    • https://cdn.shopify.com/s/files/1/0439/6960/9886/files/my_boy_friend_is_type_b.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/xabunokevegizuvudaburimi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2729/8461/files/zezoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/0145/4500/files/canciones_faciles_en_guitarra_acustica_para_principiantes.pdf
    • https://cdn.shopify.com/s/files/1/0427/4146/5244/files/82813065941.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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007662.bin
11d86ca2fc77e1bef42634ede89e95b5ea5142b4177734638c255f74c0c1736f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7662 5612 bytes
font_01_sfnt_off0000897b.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x897B 3720 bytes
font_02_sfnt_off000094df.bin
f57e80621b766c53b24761f4f7a28b5ac093058579a8a9275f9d69f06e6f9214		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94DF 11796 bytes
font_03_sfnt_off0000bae1.bin
1aa54523e4eb3abbf8233897d684586a4cd3cc218d71140ac112bc157405ca23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAE1 10212 bytes

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