Malicious PDF — malware analysis report

Static analysis result for SHA-256 e041bf82a7133678…

MALICIOUS

PDF

50.7 KB Created: 2020-08-24 01:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2af0c972d0ad6f18ddde8afa2a991958 SHA-1: a3edbab288450dfa494d0214e696b9bcf6d5ca34 SHA-256: e041bf82a71336780ca43b94b0d31cf440433d590677094c1cc63c57fc785754
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating a phishing or scam attempt. The document body, though obfuscated, includes the title 'Angle of depression and elevation worksheet' and the malicious URL, suggesting the lure is a fake worksheet. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector.

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.com/pify?keyword=angle+of+depression+and+elevation+worksheet
    • http://files.aprollers.com/uploads/1/3/1/4/131483083/26f083b4.pdf
    • http://files.beckycarlylebooks.com/uploads/1/3/1/6/131606346/4489777.pdf
    • http://files.onegratefulleader.com/uploads/1/3/1/4/131408798/4697582.pdf
    • http://files.restoremidwifery.com/uploads/1/3/0/8/130874587/6be4f04849700c2.pdf
    • https://cdn.shopify.com/s/files/1/0435/8298/0259/files/mituliketowovezaroti.pdf
    • https://cdn.shopify.com/s/files/1/0434/0760/5923/files/31275024693.pdf
    • https://cdn.shopify.com/s/files/1/0433/8047/4014/files/font_awesome_icons_code.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78108387577.pdf
    • https://cdn.shopify.com/s/files/1/0431/8881/3988/files/kisosusutigeliponolovuxev.pdf
    • https://cdn.shopify.com/s/files/1/0428/0002/1667/files/banilomorexeji.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/69651331918.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/antibiotics_chemistry_project.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4108/files/rimuf.pdf
    • https://cdn.shopify.com/s/files/1/0434/0842/5116/files/fifelovaguxabomuka.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/24491571971.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/56971163074.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c08.bin
4aba2bb845853324476be69e5ed1bf4ff35002942389efac2b843cac1129f0e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C08 2828 bytes
font_01_sfnt_off00008603.bin
f4c75f5624f7a951e195fc225cb5c96a93c013546f94a2fdc2a9de91c7a43c55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8603 5508 bytes
font_02_sfnt_off000098d5.bin
3724dcae40992bb382e376578e373e9af615393a9a72ca4e27d71a9aadeec34f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98D5 10000 bytes

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