Malicious PDF — malware analysis report

Static analysis result for SHA-256 81819f3bff6999cc…

MALICIOUS

PDF

52.3 KB Created: 2020-08-30 08:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933710c467395c50a6afdad6d9464737 SHA-1: 9f6bbdb7de761897f695659d4ef4684b63da5456 SHA-256: 81819f3bff6999cc16786b62124c6c51b993b2af54709a8a9dc184cd32b6f233
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a high density of external links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to attract traffic. The presence of numerous external links suggests an attempt to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

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.com/wix?keyword=surat+permohonan+narasumber
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b8c837_17533c3230964082bba0a1d4f4ede558.pdf
    • https://static.usrfiles.com/ugd/b8c837_e303e836fcfc4286a25534a1be6a9e77.pdf
    • https://static.usrfiles.com/ugd/ac51ce_12d5d10fa86d4d85a71681e411bd525b.pdf
    • https://static.usrfiles.com/ugd/b8c837_805e221dfd6a40e4951b39cd64c7af27.pdf
    • https://static.usrfiles.com/ugd/b8c837_c468c2040188450289c3949a2aa6740d.pdf
    • https://cdn.shopify.com/s/files/1/0440/7282/9078/files/14283948480.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/cf_auto_root_samsung_j1_ace.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3382/files/xakazabizofiweresapomesu.pdf
    • https://static.usrfiles.com/ugd/1c90dc_70aa97e46b5040f5b3724665cf03438b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b93bcd57c61e4d7ba3303213c9af9678.pdf
    • https://static.usrfiles.com/ugd/b8c837_c9a9fea88f0240649fe5c4050693dea6.pdf
    • https://cdn.shopify.com/s/files/1/0432/5795/4464/files/95362203446.pdf
    • https://cdn.shopify.com/s/files/1/0432/1801/0274/files/50093389075.pdf
    • https://cdn.shopify.com/s/files/1/0439/2553/6936/files/gonaketiwolanutuwu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2013/files/44945563604.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000074d3.bin
51a6d076086a2aa66beeb92f0b6d23a3be6473820ae1b2b025ceb1bb011db0c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74D3 5104 bytes
font_01_sfnt_off000085ea.bin
5dde7d4567ff0411f67a8626108938c72eb6952894463f0b419730163f49c66e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85EA 2376 bytes
font_02_sfnt_off0000903f.bin
b741d5b97ded1c02b39a74ca0b508b836d619e22de4d264dd116dbd6f3a7be68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x903F 10824 bytes
font_03_sfnt_off0000b544.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 4324 bytes

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