Malicious PDF — malware analysis report

Static analysis result for SHA-256 af637ffd23e269f8…

MALICIOUS

PDF

47.1 KB Created: 2020-09-26 18:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3967a1113982a822f463a0be8dac24c7 SHA-1: e8886edfdfa87cb9d373a935ecfb5cb5ed91fc56 SHA-256: af637ffd23e269f84ee02ab9c304d566fec6de098cf4a50a27b102c367bd829e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to suspicious domains and are flagged as part of a link farm. One critical heuristic identifies a link to a known malicious redirector. The document body, though heavily obfuscated, contains a query related to 'how do I restart my fitbit versa' and the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicates maliciousness.

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/wb?keyword=how%20do%20i%20restart%20my%20fitbit%20versa
    • http://xusuluxu.soundteaching.net/uploads/1/3/1/6/131607062/1047736.pdf
    • http://dolivarus.lisareimann.com/uploads/1/3/0/7/130775735/8561474.pdf
    • http://files.hoghunting.ca/uploads/1/3/0/7/130776150/rakakajula.pdf
    • http://geseta.cdostem.org/uploads/1/3/1/8/131856022/lopadazorovanoduzi.pdf
    • http://files.renatakerr.com/uploads/1/3/1/4/131437834/vafunes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6305/0394/files/makalah_pengertian_agama_islam.pdf
    • https://cdn.shopify.com/s/files/1/0435/1275/8426/files/sejalidekekufeduresekade.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8360/files/7978025733.pdf
    • https://cdn.shopify.com/s/files/1/0437/2486/5685/files/jetibevakaxeniwog.pdf
    • https://cdn.shopify.com/s/files/1/0438/0088/7457/files/wazomara.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/amman_tamil_movie_climax.pdf
    • https://cdn.shopify.com/s/files/1/0431/3707/3314/files/9329958213.pdf
    • https://cdn.shopify.com/s/files/1/0438/9978/1275/files/xirexufeme.pdf
    • https://cdn.shopify.com/s/files/1/0435/2252/3288/files/47916628010.pdf
    • https://0de33dc8-1ae5-4bbf-a096-1e979bd6bd81.filesusr.com/ugd/23b571_1a5b9c5ed3834b8792f7d47850700497.pdf?index=true
    • https://c77899f8-87de-4b5f-bd15-bc06ccf0d1b8.filesusr.com/ugd/501a20_62290c5bffe44409a8552747d0caf221.pdf?index=true
    • https://12a6f8a0-71d2-4198-bba5-5991085852ed.filesusr.com/ugd/64f9d2_95c3daed38a5488d9dd4ee416b9e6729.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cad.bin
cefdb4833e13b76974402731cbecfad38d6afa0a8893c521d4696682417565ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CAD 5056 bytes
font_01_sfnt_off00007dfe.bin
c6ec5e8fcd701400bc8e4d76bb170413e16dc695df98048a3b907a4950dcff2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DFE 10324 bytes
font_02_sfnt_off0000a16b.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA16B 4324 bytes

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